1. 2880
2. 67%
Its simple math just put in effort
By setting up a system of equations we can easily solve this problem. Let's denote Jane's working hours with x and Jack's working hours with y. Since they don't want to work more than 65 hours, the first equation is x+y=65. The second equation is 14x+7y=770. By solving this system of equation

, we find that y=20 hours, which is Jack's maximum working hours.
5=.1*x
divide both side by .1
5/.1=x
x=50 dollars
What is the rest of the question