At simple interest a sum of ₹6,400 becomes ₹8,320 in 3 years. What will ₹7,200 become in 5 years at the same rate?

​Principal (P) = ₹6,400

Amount after 3 years = ₹8,320

Time (T) = 3 years

Principal for the second case = ₹7,200

Time for the second case = 5 years

Simple interest (SI) is calculated using the formula:

​$$\text{SI} = \frac{P \times R \times T}{100}$$​​

where P is the principal, R is the rate of interest per annum, and T is the time period in years.

For first case ;

As we know rate is same ,

So, For second case,

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