Jamal’s burger stand sold 41 hamburgers for $1.25 each and 51 cheeseburgers for $1.75 each. After selling all the burgers, Jamal took $20 out of the cash register and gave it to the cook. How much money did he have left over?

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.