JAMIA 2026 — Reasoning PYQ

Method 1: Using the Direct Standard Formula

For a time period of exactly $2\text{ years}$, the difference between Compound Interest ($\text{CI}$) and Simple Interest ($\text{SI}$) is given by the direct algebraic formula:

$$\text{CI}-\text{SI}=P{\left(\frac{R}{100}\right)}^2$$

Where:

• $P=\text{Principal Amount}$

• $R=\text{Rate of Interest per annum}=10\%$

• $\text{CI}-\text{SI}=\text{Rs. }100$

Substitute the given values into the formula:

$$100=P{\left(\frac{10}{100}\right)}^2$$

$$100=P{\left(\frac{1}{10}\right)}^2$$

$$100=P\times \frac{1}{100}$$

Now, solve for $P$:

$$P=100\times 100$$

$$P=\text{Rs. }10,000$$