Q9 of 28 Page 125

Arun bought a pair of skates at a sale where the discount given was 20%. If the amount he pays is Rs 1,600, find the marked price.

S.P. = Rs.1,600 and Rate of discount

= 20%


Let M.P. be Rs.100, then S.P. for customer


= 100 – 20 = Rs.80


∵ When S.P. is Rs.80, then M.P. = Rs.100


∴ When S.P. is Rs.1, then M.P. =


∴ When S.P. is Rs.1600, then M.P. =


= Rs.2,000


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7

A milkman sold two of his buffaloes for Rs 20,000 each. On one he made a gain of 5% and on the other a loss of 10%. Find his overall gain or loss. (Hint: Find CP of each)

 8

The price of a TV is Rs 13,000. The sales tax charged on it is at the rate of 12%. Find the amount that Vinod will have to pay if he buys it.

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I purchased a hair-dryer for Rs 5,400 including 8% VAT. Find the price before VAT was added.

 1

Calculate the amount and compound interest on

(a) Rs 10,800 for 3 years at per annum compounded annually.


(b) Rs 18,000 for years at 10% per annum compounded annually.


(c) Rs 62,500 for years at 8% per annum compounded half yearly.


(d) Rs 8,000 for 1 year at 9% per annum compounded half yearly.


(You could use the year by year calculation using SI formula to verify).


(e) Rs 10,000 for 1 year at 8% per annum compounded half yearly.