The ratio of the principal and the amount (principal along with interest) in 1 year is 8 : 9 , the rate of simple interest per annum is: - Quantitative Aptitude MCQ Competitive Exams 2026 | ExamTest.live

mediumMCQCompetitive Exams2026Quantitative Aptitude

1 mark

The ratio of the principal and the amount (principal along with interest) in 1 year is 8 : 9, the rate of simple interest per annum is:

Solution & Step-by-step Explanation

Let the principal P = 8 x and the amount A = 9 x . The time period T = 1 year . The Simple Interest (SI) is: SI = A - P = 9 x - 8 x = x Using the formula SI = \frac{P \times R \times T}{100} : x = \frac{8 x \times R \times 1}{100} 1 = \frac{8 R}{100} ⟹ R = \frac{100}{8} = 12.5% = 12 \frac{1}{2} % per annum

Try it yourself before checking the explanation above.

The ratio of the principal and the amount (principal along with interest) in 1 year is 8 : 9, the rate of simple interest per annum is:

11 \frac{1}{2}

12 \frac{1}{2}

10 \frac{1}{2}

13 \frac{1}{2}

Practice with timed mock tests and track your performance across Quantitative Aptitude.