The staircase has treads that are 10 inches deep with 7 inch high risers. If the staircase needs to reach a total height of 8 feet, 2 inches. How much floor space needs to be allowed for the staircase?

140 inches

Step-by-step explanation:

The design of the staircase treads is 10 inches deep and 7 inches rise.

The total height of the staircase is 8 feet and 2 inches.

Present the height of staircase in inches as;

1 foot = 12 inches

8 ft=?

Apply cross-product as (8*12) / 1 = 96 inches

Total height in inches of the staircase = 96+2 = 98 inches

Finding the number of times the tread's height fits in the total height will be;

98/7 = 14 times

The floor space for the staircase will thus be; 10*14 = 140 inches