Answer:
7)55.6
9) 11.25
11)238.18
Explanation:
7) ;et x be the number
so the price is $139 but there is a discount of 40%. how much does she save?
so, $139=100%
x=100%-40%( why we said like this? coz am trying to show how much she will pay, if there was 40% off then she will pay the 60% only of the price)
$139=100%
x=60%, criss cross
x=$139*60%/100%
x=83.4
then to find how much she saves, the original price - x
$139-83.4
=$55.6
9) let x be the number
the original price was $75 and there were a discount for the table for 15% off.
so,
$75=100% (why we make 100%?, coz it says the original price is 75, got it?)
x=100%-15%
x=85%
so , $75=100%
$x=85%, criss cross
100%x=85*75
x=63.75, but the question says how much does she save?|
so the original price minus x
75-63.75 = 11.25
11) let x be the number
she got a rise of 32% per hour. so 100%+32 is 132%
$314.40 for a 40-hour week
$314.4=132%
x=100%, criss cross
$314.4*100=132x
x=31440/132
x=238.18
and the 238.18 is what she used to earn for a 40-hour week before her rise.
Hope it helped:)