- 1). Determine the original price and sales price of the item. For example, a computer is on sale for $1,500 with its nonsale price of $2,200.
- 2). Write the algebraic equation: nonsale price * sales percentage = sales price, then substitute in the proper values determined in Step 1. In our example, $2,200 * X = $1,500.
- 3). Arrange the formula to solve for X. In our example, X = $1,500 / $2,200.
- 4). Solve for X. In our example, X = .6818 or 68.18 percent.
- 5). Subtract the percentage calculated in Step 4 from 1 to determine the percent discount. In our example, 1 minus 68.18 percent equals a percent discount of 31.82 percent.
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