please we have:

Question #12)

a) N = 4000, since 4000*1.5/100= 60

N = 400, since 400*15/100 = 60

N = 40, since 40*15/100= 60

so:

b) if the percentage is multiplied by 10, then the number is divided by 10

c) so you have to divide 2000 by 10 and I get 200

Question #13)

a) here you have to compute this:

500 - 18/100 * 500 = 410

so Jane received $410

b) here we have:

100% -18% = 100/100 - 18/100 = (100-18)/100= 82/100 = 82%

c)

first expression: A - n/100 A

second expression: A* (100-n)/100

now please note that:

second expression = A* (n-100)/100= A*(1- n/100) = A - A*n/100 = first expression

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