Question

The average cost of 12 books is Rs 10. From this two books cost Rs 15 was sold. Find the average cost of the remaining books? 
Rs 10
Rs 9
Rs 12.50
Rs 12

Find the amount on Rs. 1600 at 2.5% interest for 2 years and 3 months? *
Rs 190
Rs 1900
Rs 1190
Rs 1690
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Answer 1

Answer:

1. Cost of 12 books (Average) = Rs 10

Cost of 2 books = 15

15 + x/12 = 10

15 + x = 120

x = 120 - 15

x = 105

Remaining books cost = 105

Remaining books = 10

Average = 105/10

= 10.5

2. 1600 × 2.5 × 1.25/100

16 × 2.5 × 1.25

50

Amount = 1600 + 50

= 1650

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