John's gross income is $1,000 per month. Based on an assumption that 25% of his gross income will be withheld, he can expect his disposable (spendable) income to be _______ per month.

A. $650

B. $750

C. $850

D. $950

help I am not sure on this I am lost every answer I arrive at is inaccurate

0.75 * 1,000 = ?