Rearrange the Words Below to Make the Best Sentence

Rearrange the words below to make the best sentence. Select the last letter of the last word as your answer.
Mat feet the your Wipe on 1 A contractor is planning a new floor for a ballroom that will be 160ft. × 80ft. The plan includes a 40ft. × 80ft. dance floor, which will cover ______% of the ballroom. (Enter numerical values only. If necessary, round to nearest ones place.)

A) e
B) mat
C) Wipe
D) r
E) t