Question

A sum of ₹ 6500 amounts to ₹7800 in 4 years Find the rate of interest​

Answer 1

Answer:

the simple interest is 7800-6500=1300

si=ptr/100

1300=6500*4*x/100

x=1300*100/6500*4

x=5

the rate of interest is 5%

Answer 2

Answer:

i = 5%

Step-by-step explanation:

METHOD 1

Simple intrest = si = pit

Principle = (p) = 6,500

Rate = ?

Amount = ( P + I ) = 7,800 i = 7,800-6,500 = 1,300

Time = (t) = 4

SI = P × i × t

1,300 = 6,500 × i/100 × 4

1,300 = 26,000 i /100

26,000i = 1,30,000

i = 1,30,000/26,000 = 5

METHOD 2

A = P(1 + it)

Amount = ( P + I ) = 7,800

Principle = (p) = 6,500

Rate = ?

Time = (t) = 4

7,800 = 6,500( 1 + i× 4)

7,800/6,500 = 1 + 4i

1.2 = 1 + 4i

0.2 = 4i

i = 0.05

i = 5%