Whats a math problem. with the equation 5xn=20

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Alex's monthly take home pay is $2,500. what is the maximum bad debt payment he can maintain without being in credit overload?

Meee i honestly dont know what this question talking about

Astore is having a sale in which all items are reduced by 20 percent. including tax, jennifer paid $21 for a pair of shorts. if the sales tax is 5 percent, what was the original price of the shorts