A bicycle store costs $1800 per month to operate. The store pays an average of $35 per bike. The average selling price of each bicycle is $75. How many bicycles must the store sell each month to break even?

45

Step-by-step explanation:

1800 total

35 dollars per bike

75 bucks to sell bike

75-35= 40

40 bucks per bike

1800 divided by 40 = 45 so 45 bikes

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

step-by-step explanation: