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Question 151970: please help: after a bad day on wall street, mr.magnum lost 30% of his money, but he had $3500 left. how much money did he orginally have at the beginning of the day?: please help: after a bad day on wall street, mr.magnum lost 30% of his money, but he had $3500 left. how much money did he orginally have at the beginning of the day?
Answer by jojo14344(814) About Me  (Show Source):
You can put this solution on YOUR website!
Let "x"= original money he got
So, if he lost 30%: --------> [x-30%x=$3500], working eqn
Continuing,
x(1-0.30)=3500 -----> x(0.70)=3500
x*cross(0.70)/cross(0.70)=cross(3500)5000/cross(0.70)
x=5000 ----------> original money he has
In checking, we'll go back, losing 30%:
$5000-30%($5000)
$5000(1-0.30)
$5000(0.70)
$3500
Thank you
Jojo