Shopping Mall Kiosks For Sale

Word problems for equations help?
Jack works in a kiosk cell phone service at a mall. He earns $ 8.50 hour plus a commission of 4.5 in total weekly sales. a) What dollar amount of sales of mobile phones must do to earn $ Jack 350 in a 30-hour workweek? b) How many hours Jack has to work to earn $ 439 if your total weekly sales are $ 2200. THANKS!
a) As far as ($ 8.50 * 30) + 4.5% x $ 350 = $ 255 + 4.5% x $ 350 = 0045 x = 95 x = $ 2111.11 b) 8.5x + 4.5% $ 2200 = $ 439 8.5x + 99 = $ 439 = $ 8.5 x 340 x = 40 hours
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