30 shares of stock were purchased for \( \$ 30 \) per share with a \( \$ 6 \) commission. What is the total cost of this investment? Total Cost \( =\$[?] \)

Calculate the gross profit margin for an item that cost the business \( \$ 12 \) and sold for \( \$ 30 \). Gross Profit = \( \$ 18 \) Gross Profit Margin = [?]\%

Calculate the gross profit margin for an item that cost the business \( \$ 36 \) and sold for \( \$ 80 \). Gross Profit \( =\$ 44 \) Gross Profit Margin \( =[?] \% \)

A perfectly competitive firm has the following information in the short run. Total cost equation is given as \( T C=3 q^{2}+20 q+75 \); and the firm is currently producing 10 units of output which is the profit maximizing output level. 1. Find the profit maximizing price at which 10 units will be sold. 2. Find the level of profit or loss the firm is making in the short run. 3. What is the firm supply curve (equation)?

A lawnmower was traded in for R236 after 10 years. The depreciation was calculated at \( 9,2 \% \) p.a. on a straight-line basis. Determine the cost of the lawnmower 10 years ago.

الف) . . זا دلار چند پوند است؟ (با راه حل) ب) رابطه بين دلار و پوند را روى نمودار نشان دهيد.