15% is 10% + 5% (or 0.15 = 0.1 + 0.05, dividing each percent by 100). Thinking about it this way is useful for two reasons. First, it's easy to multiply any number by 0.1; just move the decimal point left one digit. For example, 75.00 x 0.1 = 7.50, or 346.43 x 0.1 = 34.64 (close enough).
What's 80 percent-off $300? Amount Saved = $240 (answer). In other words, a 80% discount for a item with original price of $300 is equal to $240 (Amount Saved).