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Percentage: Problem and Solution Part - 12
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Percentage problem and its solution using shortcut approach

## Bharat Gupta is teaching live on Unacademy Plus

Bharat Gupta
An engineer by degree Mathematician by Heart. Having 23 years of teaching experience. 10% discount code BHARAT_GUPTA

U
Thank you Sir for the lesson.
Sir, in first question, I think ans should be 25%, not 10%. Because, the question is asking for change in SAVINGS PERCENTAGE, not change in savings. So, initially he was saving 20% of his income. Later, he's saving only 15% of his income (18/120 * 100 = 15). So, the change in savings percentage is ((20 - 15)/20)*100 = 25%
Lk
Luv kapruwan
10 months ago
true
8 months ago
yes sir
Aman Kumar
4 months ago
Correct
sir 2nd question balancing method se krne par answer d aa rha h
TK
sir at 8:28, how did you get the equation 2x+x^2 =75
at 2:27 they asked on all average which means he can copy 0.5% on second book p/750=0.5/100 ,,,, so around 3 pages right?
SM
Sumit Menaria
3 months ago
sir ne question hi change kar Diya 750 Ka 1750 Kar Diya h
great sir we love you....its helps a lot... thank you very much sir
1. Percentage Problem Er. Bharat Gupta Having 20 years of teaching experience. Authored several books published by Pearson, Vikas, Unique publication etc Any query or suggestion, share your comments.

2. A person used to save 20% of his income. Since his income has increased by 20% , he started giving its 10% to charity. Now he is saving 165%of his income after donation to charity. His saving percentage has changed by a. 10% 3 b. 15% c. 22.22% d. 25%

3. A person used to save 20% of his income. Since his income has increased by 20% , he started giving its 10% to charity. Now he is saving 16 %of his income after donation to charity. His saving percentage has changed by a. 10% b. 15% c. 22.22% d. 25% I NCoME INITIAL 20 FINAL I20 lob 18 2 Cn 20

4. The first book authored by Rajeev had 1000 pages in it, out of which 50 pages were copied from some other and hence, it was 95% original. In his second book of 750 pages, at the most how many pages can he copy from the other authors so as to maintain 97% originality, on all average in the books he has authored? a. Just 1 page c. up to 3 pages d. He should not copy at all b. up to 2 pages

5. The first book authored by Rajeev had 1000 pages in it, out of which 50 pages were copied from some other and hence, it was 95% original. In his second book of 750 pages, at the most how many pages can he copy from the other authors so as to maintain 97% originality, on all average in the books he has authored? a. Just 1 page c. up to 3 pages b. up to 2 pages d. He should not copy at all origin a 1 So (45)So (s) o8o 1 sa . Ton 17So 167752(97%)

6. Potatoes are made up of 99% water and 1% "potato matter". Jack bought 100 kg. of potatoes and left them outside in the sun for a while. When he returned, he discovered that the potatoes had dehydrated and were now only made up of 98% water. How much did the potatoes now weigh ? a. 99 kg b. 25 kg c. 50 kg d. 98 kg

7. Potatoes are made up of 99% water and 1% "potato matter". Jack bought 100 kg. of potatoes and left them outside in the sun for a while. When he returned, he discovered that the potatoes had dehydrated and were now only made up of 98% water. How much did the potatoes now weigh ? a. 99 kg b. 25 kg c. 50 kg d. 98 kg FrehY loohk

8. In a medical examination, by mistake a candidate gave his height as 25% more than normal. In the interview panel, he clarified that his height was 5 feet 5 inches. Find the percentage correction made by the candidates from his stated height to his actual height. a. 20% b. 28.56% c.25% d. 22.5%

9. In a medical examination, by mistake a candidate gave his height as 25% more than normal. In the interview panel, he clarified that his height was 5 feet 5 inches. Find the percentage correction made by the candidates from his stated height to his actual height. a. 20% b. 28.56% c.25% d. 22.5%

10. In the Polo hospital some patients who were suffering from the Hepatitis-B were admitted for the treatment, but 9% of the patients were died within half an hour. After treatment, the percentage of patients cured out the remaining was only 80%. Out of these patients only 70% are completely cured out and the remaining were partially cured out, which were equal to 153 patients. The no. of patients (approx.) who were admitted for the treatment for the same was a. 400 b. 678 C. 560 d. 700