Hi I need help with this problem below:

The question asks in acidic conditions, the sum of the coefficients in the products of the balanced reaction is:

MnO4-+C3H7OH---->Mn+2+C2H5COOH

I think this is a redox reaction balancing problem.

So far

I got 5e-+8H++MnO4- ------> Mn+2 + 4H2O

I can't seem to figure out how to do this with C3H7OH and then multiply each equation to help cancel out terms.

The answer is D. 20 but I don't know how to get this answer.