Answer:
when you ask multiple questions at once, it feels more like i'm doing your HW for you, not that i'm helping you understand , i'll answer these but you really should have been able to do these if you really did all the others. Did you just get tired out? Why can't you do 4, 6, 8? what is it that you don't understand?
Step-by-step explanation:
4) old price = 120 to new price = 240
they ask what is the percent change
How much is the change ( in amount )
the "How much is obvious right? Old price 120 , new price 240.. change is $120
the percent is change / old price = 120 / 120 = 1 and to put it in percent , multiply by 100 , so 100 % change
6) old price = 250 amount of change -100
so what percent of 250 is 100
100 / 250 = 0.4 to get it in percent multiply by 100 = 40%
old price + change = new price
250 + ( -100) = 150 new price is $150
8) 5% mark up , amount of change = $2.50
so 5% of what = 2.50 ?
X* 5% = 2.5
X* 0.05 = 2.5
X=2.5/0.05
X= $50 was the old price
old price + amount change = new price
50 + 2.50 = 52.50
$52.50 is the new price
