Gain x% selling at y% discount on marked price; cost price changes by z%: new discount for the target profit

The same question, asked 2 times: 29 Jan 2022 Tier II*, 3 Feb 2022 Tier II. Every wording below, oldest first.

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Question 1
29 Jan 2022 Tier II
73 $A trader gains 25% by selling an article with 20% discount on its marked price. If the cost price of the article increases by 30%, then how much discount (in %) should he offer on the same marked price to gain 15% of profit?$
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Question 2
3 Feb 2022 Tier II
50 $A dealer gains 20% by selling an article at 25% discount on its marked price. If the cost price of the article is decreased by 15%, how much discount percentage should he now give on the same marked price so as to earn the same percentage of profit as before?$
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Question 1