The answer is 68 because if it rose between the times it would mean you minus 7 from 75
To start off, Chang has already saved $45. $125 - $45 = $80. Therefore, he owes $80. $80 ÷ 7 = 11.4285714286, so he needs to work 12 full hours to pay for his trip.
1/5x1/2=1/10
1/5 because there are 5 flavors.
1/2 because there are 2 kinds of pies.
So the answer is 1/10.
Hope this helps.