In which situation is the original price bigger? (a) after a 5% discount the price was $190; (b) after a 10% discount the price was $180; (c) after a 20% discount the price was $170; (d) after a 30% discount the price was $140.

C

Step-by-step explanation:

Calculate each one of them to see which one is highest:

a)190/.95 = 200

b) 180/.9 = 200

c)170/.8 = 212.5

d)140/.7 = 200

what is the starting amount? the question is not clear sorry.

step-by-step explanation:

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