Decrease 640 by 24 percent

486.4

Step-by-step explanation:

Multiply 640 by the percent and then subtract the percent from the whole since the question is asking for a decrease by 24 percent, not what 24 percent of 640 is.

640 * 0.24 = 153.6

640 - 153.6 = 486.4

486.4

Step-by-step explanation:

640 - (24% * 640) =

(1 - 24%) * 640 =

(100% - 24%) * 640 =

76% * 640 =

76 : 100 * 640 =

76 * 640 : 100 =

48,640 : 100 =

486.4