This may help https://www.ck12.org/geometry/Reflection-Symmetry/lesson/Reflection-Symmetry-GEOM-HNRS/ If not wait for somebody else. I hope it does help, though. Good luck! :)
87 is 5 less than 1/2 of the price without a sale. in that case 92 would be half the cost. To find the full value you would multiply 92 by two to get 184
