a sum of money amounts to rupees 10000 after 5 years and Rs 15,000 after 8 years at the same rate of simple interest find the rate of interest per annum
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P + I = 10000
P + PTR/100 = P + P .5. R/100=10000................EQUATION 1
and P + P. 8 .R/100 = 15000................................EQUATION 2
Dividing equation 1 by 2, we get 100 + 5R/100 +8r =2/3
Solving , We get R= 100%
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