b) 2 : 3 : 4
c) 3 : 4 : 6
d) 3 : 4 : 2
Answer: a
Explanation: Let the principal in each case = 100 units
1st part | 2nd part | 3rd part | ||
Principal | → | 100x6 | 100x3 | 100x2 |
Rate % | → | 10 | 12 | 15 |
Time | → | 6 | 10 | 12 |
Interest | → | 60x6 | 120x3 | 180x2 |
Required ratio
= 600 : 300 : 200 of sum
= 6 : 3 : 2
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