Fill in the missing factor: 60,000,000 = 6 •

It's 6 to the power of 7

Explanation:

1) The parking in A-park costs 1.25 per hour; however, if you get a membership for 50 dollars, it only costs 0.75 per hour. At what hour would the cost of parking be equal no matter whether you get a membership?
2) 
1/6 x = 1/12 x + 5/3
3)
0.1x = 0.01x + 2.25