Capital split across different interest rates: total interest

CAT has tested this idea 6 times across 5 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 2019 Slot 1 · QA Q11	15 lakh: part at 6%, rest split 2:1 at 4% and 3%	9
CAT 2025 Slot 1 · QA Q21	stocks, bonds, gold at 10%, 6%, 8%; bonds = 25% of gold	900
CAT 2022 Slot 3 · QA Q9	three banks, combined interest 5% of capital	D
CAT 2019 Slot 1 · QA Q23	investments 3:4:5 at rates in ratio 6:5:4	D
CAT 2022 Slot 2 · QA Q18	fractions at 6%, 10%, 1%; years for interest to equal capital	20
CAT 2022 Slot 1 · QA Q16	equal SI on two parts at different rates and years	B

Part of Interest (19 questions since 2017).