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Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

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An online store is offering two different discounts on its sweaters: a bulk discount for large orders and a coupon discount. For orders of $n$ sweaters, where $10<n<50$, a bulk discount of $n\%$ off the original price of $50 is applied to the price of each sweater. If a coupon is applied to the order, a discount of an additional $4 is applied to the price of each sweater, after the bulk discount is applied. For a certain order with both the bulk discount and the coupon discount applied, the total price after the discounts was $930. How many sweaters were purchased in this order?

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