Because it specialises the groups that go into the number.
42 (1- 25/100) = 63/2 = 31.5 dollars
answer is $31.50
hope it helps
40 percent of 250 = .4*250 = 100
100 seventh graders got the flu.
Recall that
where 
is the angle between the vectors 
whose magnitudes are 
, respectively.
We have
first one: 1200/1.5 = 800, second one: 20,000/10= 2000, third one: 400/20 = 20, fourth one: 266.6, fifth one: 33.3, sixth one: 1000. You're welcome!!
