10.20 x 9 = 91.8
( It's William and nine/eight friends, since they're dividing it among ALL people we count William in. )
A: William and nine friends divided the bill evenly. If each person paid $10.20, what was the total bill?
10.20 x 10 = 102
B: At a restaurant, William and eight friends divided the bill evenly. If each person paid $10.20, what was the total bill?
10.20 x 9 = 91.8
C: At a restaurant, William and nine friends divided the bill evenly. If the total bill was $91.80, what did each person pay?
91.80 x 10 = 918
D: At a restaurant, William and eight friends divided the bill evenly. If the total bill was $91.80, what did each person pay?
91.80 x 9 = 826.2
So, your answer is B
