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Find the simple interest on ₹600 at 7% per month in 9 months.
₹398
₹334
₹354
₹378
₹378
Since the rate is already per month and time is in months, just calculate 600×0.07×9, which simplifies to 6×7×9=42×9=378.
Principal (P) = ₹600, 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, just calculate 600×0.07×9, which simplifies to 6×7×9=42×9=378.
Students often mistakenly try to convert the time into years by dividing by 12, but because the rate is specifically 'per month', the time must remain in 'months'.
Identify given variables
Identify the principal amount, monthly rate, and time period provided in the question.
P=600,R=7%,T=9
Apply Simple Interest formula
Use the standard formula for Simple Interest. Since the rate and time are both aligned to months, no unit conversion is needed.
SI=100600×7×9
Calculate the result
Cancel the zeros in the numerator and denominator, then multiply the remaining digits: 6×7×9.
SI=6×63=378
D is correct because the calculated simple interest is ₹378.
Always verify if the rate and time units match (e.g., annual rate with years, or monthly rate with months) before applying any formula to avoid scaling errors.
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