Find a single discount equivalent to a series of discounts of 10 percent, 20 percent and 30 percent.

The single equivalent discount is 49.6%.

Successive discounts multiply the remaining fraction: 0.90 x 0.80 x 0.70.

This equals 0.504 of the marked price.

The amount paid is 50.4%, so the discount is 100% - 50.4%.

The single discount is 49.6%.