Simple interest from SI = PRT/100 with given principal, rate and time

This type of question, asked 2 times: 8 Aug 2022 Tier II, 26 Oct 2023 Tier II. All 3 questions below, oldest first.

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Question 1
8 Aug 2022 Tier II
89 $What will be the simple interest on a sum of ₹12000 at the rate of 15 percent per annum for three years?$
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Question 2
8 Aug 2022 Tier II
56 $Sum ₹ 20000 and ₹ 40000 are given on simple interest at the rate of 10 percent and 15 percent per annum respectively for three years. What will be the total simple interest?$
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Question 3
26 Oct 2023 Tier II
29 $The simple interest earned on ₹2,800 at a rate of 10% per annum for 3 years is ₹x and ₹1,736 is the simple interest earned on ₹6,200 at a rate of 14% for y years, then the value of x/y is:$
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Question 1