Math!

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Pls help me on this, i dunno the answer but i got the answer of my own, but its wrong nad this paper is already marked, but i still cant seem to understand how to solve this!

A furniture store bought an item for $810 less 15%. The store's expenses are 38% of the cost and the operating profit is 22% of the cost. During a sale, the item was marked down by 15%.

a) determine the regualr selling price of the item?

b) Determine the Sale price.

c) What was the profit of loss realized on the item during the sale?

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