Question

what is the intrest of rs2160 at the rate of 20% for 4years?in how many years will rs1800earn the same intrest at the rate of 12%​

Answer 1

considering it was simple interest,

We have the formula:

I = PRT ÷ 100

where,

• I = Interest
• P = principal
• T = time (in years)
• R = rate

for the first part of the question,

• P = Rs. 2160
• R = 20
• T = 4

Thus, I = (2160 × 20 × 4)÷ 100

I = Rs. 1728

Now, for the second part,

• P = Rs. 1800
• I = 1728
• R = 12

T = 100×I÷PR

T = 100 × 1728÷(1800 × 12)

T = 8 Years