Question

the diffrence between the compound intrest and the simple intrest accrued on an amout on Rs.18000in 2years was Rs.405 what was the rate of intrest per annum​

Answer 1

Answer:

The rate of interest per annum is 15%

Step-by-step explanation:

Given:

C.I – S.I. = Rs. 405

Principal = Rs. 18,000

Time = 2 years

Formula used:

If the difference between compound interest and simple interest is given and the rate of interest is given, then the formula for calculating principal is:

C.I. – S.I. = P(R/100)2

R → Rate

P → Principal

Calculation:

405 = 18000 (R/100)2

⇒ 405  = 18000 × (1/100)2 × R2

⇒ R2 = 405/1.8 ⇒ 225

⇒ R2 = 152

⇒ R = 15%

∴ The rate of interest per annum is 15%

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Answer 2

Answer:

rate of interest per Annum is 15