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Find the simple interest on ₹800 at 7% per month in 9 months.
₹514
₹524
₹534
₹504
₹504
Since the rate is already 'per month' and time is in 'months', simply calculate (P×R×T)/100. With 800 as the principal, the calculation becomes 8×7×9.
Principal P = ₹800, Rate R = 7% per month, Time T = 9 months
SI=100P×R×T
Since the rate is already 'per month' and time is in 'months', simply calculate (P×R×T)/100. With 800 as the principal, the calculation becomes 8×7×9.
Do not divide by 12, as the rate is already given 'per month', not per annum.
Identify given values
Identify the principal amount P, the rate of interest R per month, and the time period T in months.
P=800,R=7%,T=9
Apply the Simple Interest formula
Using the standard SI formula for a monthly rate, we calculate: SI=100800×7×9.
SI=100800×7×9
Perform calculation
Simplify the expression: SI=8×7×9=56×9=504.
SI=504
D is correct because the calculated simple interest is ₹504.
Always check if the rate is 'per annum' (p.a.) or 'per month' before applying the time conversion factor 1/12.
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