25% = a quarter.
A quarter of 1600 = 400 and a quarter of 4 = 1
so a quarter of 1600 - 4 = 400 - 1
that is, a quarter of 1596 = 399.
The actual number, 1595, is one less so a quarter of that is a quarter less. Thus the exact answer, with only a little effort, is found to be 399-0.25 = 398.75
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When you mulitply any number by .25 your answer will be 25 percent of the number.
45 is 25 percent of the number 180
To determine what 25 percent of a number is, multiply the number by 0.25
121 is 25 percent of 484.
25 percent of 180 is 45.