You want to buy three books that are on sale at 20% off. the original prices of the books are $2.50, $4.95, and $6.00. how much will you save? calculation with distribution (show all steps.) calculation without distribution (show all steps.)

20% off means they will be 80% of their original price. Obviously, we can answer the question as a percentage without even thinking. We will save 20% of the ultimate price.

The first step is to find the cost of everything at 80%. 
2.00, 3.96, and 4.80
That adds up to 10.76
The original cost would have been 13.45, so you saved 2.69

B.the point lies directly on the regression