Question 25755
Let C = the cost of the goat.
Expected sale price = C + 10% of C
Actual sale price = (C + 10% of C) - $ 50
Cost less 15% = C - 15% 0f C

C + 0.1C - $50 = C - 0.15C  Simplify and solve for C
1.1C - $50 = 0.85C Add $50 to both sides.
1.1C = 0.85C + $50 Subtract 0.85C from both sides.
0.25C = $50 Divide both sides by 0.25
C = $200

Bob payed $200 for the goat.