You are purchasing 2 shirts at $15.00 (each) and 1 pair of jeans at $30.00 (each) you have a coupon for 10% off. how much is the total cost with the discount?

$54.00

Step-by-step explanation:

You subtract 10% off original price (100%) and get 90%. Bring the 1% value of $60 (0.6) you get from dividing the original cost by 100 and multiply that by the true cost 90 to find the answer.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional