Question

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

Answer 1

Answer:

amount=400×2

=₹800

SI=800-400

=₹400

SI=P×R×T/100

a/q

400=400×10×t/100

400×100/400×10=t

10=t

so, required time to double a sum of ₹400 at 10% per annum=10 years.

hope it helps you...