Simple Discount Rule.

This simple rule is in use in many houses where several discounts are allowed from list prices. Suppose the list price of a piano to be $500, and you allow an agent 25, 20 and 10 off.

100100100
252010
75×80×90=.540000

Subtract each from 100 and multiply and you get .54. $500 × .54 = $270, the agent’s price.

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