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Apt Simple Interest — Free Aptitude Tutorial

Learn Apt Simple Interest in Aptitude with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Apt Simple Interest in Aptitude with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

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Apt Simple Interest in Aptitude

Simple Interest (SI) = (Principal × Rate × Time) / 100. Where P = Principal (₹), R = Rate (% per annum), T = Time (years).

Amount (A) = Principal + SI = P + PRT/100 = P(1 + RT/100).

Finding Principal: P = (SI × 100) / (R × T).

Finding Rate: R = (SI × 100) / (P × T).

Finding Time: T = (SI × 100) / (P × R).

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