If lauryn has purchased 4 books you have to do (2x-12)^4. Expand it to: (2x-12)(2x-12)(2x-12)(2x-12) multiply together. Then solve for x. If you need more help let me know.
So basically find 3% of 56.75 percent means parts out of 100 so 3%=3/100 'of' means multiply 3/100 times 56.75=0.5675 transaction fee=$0.57 (rounded up)
