Answer
9.68 in
Work Step by Step
Convert to a decimal by dividing the numerator by the denominator.
$8\frac{7}{8}\ in=8.875\ in$
Multiply the riser height by 12 to find the total height of the staircase.
$8.875\ in\times12=106.5\ in$
Divide the total height by 11 to find the new riser height.
$106.5\ in\div 11=9.68\ in$
