Buy 50 Chevron at $17, plus a two percent commission (too much).
Cost of stock: 50 shares × $17 per share = $850
Commission is 2% of 850 = .02 × 850 = $17
Total is $867
The quiz police will delete this shortly. Personally I think learning during your quiz is just as good a time as any, maybe better as now you're motivated. This is real life stuff, useful to know beyond any quiz that comes and goes.