1) An investor splits ₹1,20,000 into two accounts such that one account yields 8% annual interest and the other 10%.
If the combined annual interest is ₹10,200, how much was invested at 10%?

2) An item priced at ₹1500 is first discounted 20%, then the sale price is increased by 10%.
Find the final price.

3) A price is first decreased by 12%, then the new price is increased by 15%.
What is the net percentage change?

4) After a 25% increase, a value becomes ₹315.
What was the original amount?

5) Flour, sugar, and cocoa are mixed in the ratio 5 : 3 : 2 to make 5 kg of mixture.
How many grams of sugar are used?

6) Two numbers are in the ratio 9 : 14.
If each is increased by 20, the new ratio becomes 5 : 7.
Find the original numbers.

7) Rina scored 72 marks in a test and failed by 18 marks.
If the pass percentage is 45%, find the total marks of the test.

8) A sum doubles in 10 years under simple interest.
What additional time (in years) will it take to become four times as much?

9) In how many hours will 5 pumps working at rates in the ratio 1 : 2 : 3 : 4 : 5 finish a job that one pump alone (rate = 1 unit/hr) would take 120 h?

10) Two alloys (copper : tin = 4 : 1 and 3 : 2) are mixed in a 2 : 3 weight ratio.
What is the copper : tin ratio in the mixture?

11) Riya, Sameer, Tanvi, and Om complete one lap in 24 s, 30 s, 40 s, and 54 s respectively.
After how many seconds will they all meet at the starting point?

12) A chemist has solutions A and B containing 10% and 25% acid respectively.
How many litres of each must he mix to obtain 40 L of a 16% solution?

13) A wholesaler gets goods at 10% below list price, marks them 20% above list, and then offers a 10% discount on the marked price.
What is his profit percentage?

14) Ankita has a jar of candies.
40% are chocolates, 60% of the remaining are toffees, and the rest are mints.
If there are 30 more toffees than mints, how many candies are chocolates?

15) The selling price of a certain refrigerator is ₹1,475 more than the price the store paid.
If the selling price is ₹18,250, then the price the store paid is:

16) A fund is divided among A, B, and C in the ratio 5 : 7 : 8.
A invests 25% of his share, B invests 30%, and C invests 40%.
If the total investment is ₹1,310, what was the original fund?

17) Arjun, Bhavik, and Charu complete one round in 36 s, 45 s, and 60 s respectively.
After how many seconds will they all be together again at the starting point?

18) The present ages of Meera and Nisha are in the ratio 5 : 8.
The product of their ages is 1960.
Find the difference between their ages (in years).

19) A shopkeeper marks up 40% on cost but gives 20% off.
To still earn 10% profit, what additional flat rebate per item (cost = ₹100) must he offer?

20) A class has boys and girls in the ratio 7 : 5.
If 40% of boys and 50% of girls opt for basketball, and there are 53 students playing basketball, how many girls are there in the class?