Question

At what rate of percent of simple Interest will rupee 6400 amount to rupees 9800 in 4 years​

Answer 1

Answer:

Rate=13.28%

Step-by-step explanation:

Principal=6400₹

Amount=9800₹

Time=4 years

Rate=?

Interest=Amount-Principal

=9800-6400

=3400₹

Rate= Interest×100/Principal×Time

=3400×100/6400×4

=17×25/32

=13.28%

Answer 2

Answer:

rate of interest = 13.28%

Step-by-step explanation:

principal = 6400

time = 4 years

let, rate of interest = r%

amount = p + p*r*t/100

6400 + (6400*4*r)/100 = 9800

or, (6400*4*r)/100 = 9800 - 6400

or, r = (3400*100)/(6400*4)

or, r = 13.28