Question

after how many years does a sum of Rs 400 become double at simple interest of 10% per annum​

Answer 1

Step-by-step explanation:

principle = Rs 400

Rate = 10%

S.I = 400×2 = Rs 800

Time = ?

S.I = P × R × T / 100

800 = 400 × 10 × T / 100

800 = 40×T

T = 800/40

T = 20 years

Hope it helps you....