SI loan where the rate is tied to the number of years, interest given: rate

The same question, asked 2 times: 19 Jul 2023 S2*, 18 Sep 2025 S2. Every wording below, oldest first.

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Question 1
19 Jul 2023 S2
70 $A man took a loan of ₹32,400 at a certain rate of simple interest per annum. The rate of interest is one-fourth of the number of years for which the loan is taken. If he paid ₹11,664 as interest at the end of the loan period, the rate of interest was:$
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Question 2
18 Sep 2025 S2
57 $Reena borrowed Rs. 1200 at simple interest for a number of years equal to the rate of interest. At the end of the loan term, she paid Rs. 432 in interest. What was the interest rate?$
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Question 1