Question

A sum of rupees 4000 becomes rupees 5000 in 2 years at a certain rate of simple interest. what is the rate of interest per annum? ​

Answer 1

Answer:

SI=pnr/100

5000–4000=4000×5×r/100

(1000×100)/4000×5=r.

r=100000/20000=5%

Now new rate will be 5+2=7%

A=4000+pnr/100=4000+(4000×5×7)/100=4000+40×5×7=4000+1400= 5400 ans