Comparing simple and compound interest on the same principal

CAT has tested this idea 4 times across 4 papers, from 2019 to 2025. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2025 Slot 1 · QA Q6	SI amounts at 3 and 6.5 years; then half-yearly CI	D
CAT 2020 Slot 2 · QA Q8	2-year CI exceeds 3-year SI by Rs 1125	90000
CAT 2021 Slot 3 · QA Q21	half-yearly CI bank vs two SI banks	A
CAT 2019 Slot 2 · QA Q32	two CI deposits give same interest as one SI deposit	20920

Part of Interest (19 questions since 2017).