Just do the whole process backwards
700*0.01=7
7-2.84=4.16
4.16/0.8=5.2
5.2+1.05=6.25
85 is the correct answer.
Answer is 7950,72. You can solve it's task on calculator.
You would set the equations equal to eachother and get x=-5/4 and then plug that in for x, i hope this helps!
