Question

A certain sum of money at simple interest amount to 13000 in 4 years and to 15250 in 7 years find the sum and the rate per cent​

Answer 1

Answer:

Step-by-step explanation:

Amount after 2 years =Rs.783

Amount after 3 years =Rs.837

Therefore,

S.I. of 1 year =837−783=Rs.54

⇒ S.I. of 2 years =54×2=Rs.108

Principal sum =783−108=Rs.675

Therefore,

S.I.=  PRt\100

​⇒54=  675×R×1 \100​  

⇒R=  54×100 \675 =8%

Answer 2

1. principal+interest for 4 year=1300
2. principal + interest for 8 years=1525
3. subtract
4. for 3 years=225
5. then for 1 year =75
6. 4year interest 75×4=300
7. subtract from 1
8. 1300–300=1000
9. principal=1000
10. please mark me brainleist
11. hope it helps