Chambers Company Sells Glass Vases at a Wholesale Price of $2.50

Chambers Company sells glass vases at a wholesale price of $2.50 per unit. Variable cost is $1.75 per unit. Chambers' fixed costs are $6 500 per month. Chambers is currently selling 15 000 units per month. If Chambers wants to increase net profit by 20%, how many more units, over and above the current volume, must they sell? (Please round to nearest whole number.)

A) 1 166
B) 1 333
C) 5 666
D) 1 267