SOLUTION: If something is on sale for 30% off than 20% off of sale price if it's not 50% what is the formula?

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Question 471423: If something is on sale for 30% off than 20% off of sale price if it's not 50% what is the formula?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
30% off means that 70% of the price is still there. Let's assume that the cost of something is 1. Then the 30% sale implies that the price afterwards is (.7)(1) = .7. This price is discounted by 20% (e.g. multiplied by .8), so the final price is (.8)(.7) = .56, a 44% discount.