Question

10. After allowing a discount of 12% on the marked price of an article it is sold for 880. Find its marked
price.
11. The simple interest on a sum of money is 1/4 th of the principal and the number of years is equal to rate
4
per cent per annum. Find the rate per cent.​

Answer 1

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Answer 2

10. Let x be the marked price. 12x/100+880=x

880=x-12x/100

880=x(1-12/100)

880=x(22/25)

x=880*25/22

x=1000. Answer 

Hence, the marked price is rs. 1000

11. For ,

N=4years

R=4 % 

We have S.I.=100PNR=100P×4×4=10016P=0.16P

And on interest being compounded for 3  years and R=5 %, Amount=P(1+100R)N=P(1+1005)3=P×(1.053)=1.157625P

So, C.I.=A−P=1.157625P−P=0.157625P

Given, S.I.−C.I=Rs228

=>0.16P−0.157625P=Rs228

=>0.002375P=Rs228

=>P=Rs96,000