Please help me . needs to be done asap

What is the multiplicative rate of change of the exponential function shown on the graph?

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68