Difference between the SIs on two loans

This type of question, asked 2 times: 9 Sep 2024 S2, 23 Sep 2024 S1. All 2 questions below, oldest first.

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Question 1
9 Sep 2024 S2
57 $If a sum of ₹5,000 is taken at a simple rate of interest of 15% per annum for 3 years and another sum of ₹8,000 is taken at a simple interest of 12% per annum for 4 years, the positive difference of the interests paid is:$
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Question 2
23 Sep 2024 S1
58 $The difference between the simple interests on the principal of ₹500 at an interest rate of 5% per annum for 3 years and 4% per annum for 4 years is:$
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Question 1