Question

a sum invested on simple interest grown r to rs22500 and re25500 in seven and nine years what is the percentage of the interest ​

Answer 1

Answer:

12.5%

Step-by-step explanation:

from 7th yr to 9th year

i=prt/100

intrest=3000

so for 1 year interest is 1500(as it is simple intrest equal amount of inttest every year)

so for 7 years interest is 7×1500=10500

so p=22500-10500=12000

10500=12000×r×7/100

1050000=12000×7×r

r=1050000/(12000×7)

r=12.5%