 
 <translate> He gets 500 * .8 = $400 off the cost of lenses. That means the lenses cost 500 - 400 = $100. The frames cost 200 - 50 = $150. So he pays 100 + 150 = $250.
The answer: 250. <hau> Yana samun 500 *.8 = $400 daga farashin ruwan tabarau. Wannan yana nufin cewa ruwan tabarau na da farashin 500 - 400 = $100. Tsarin ya biya 200 - 50 = $ 150. Don haka ya biya 100 + 150 = $250. Amsar ita ce: 250. 