At the beginning of its operations in July $2024,$ Pharoah Pet Shop Ltd$.$ began with $8,550$ units of inventory that it purchased at a cost of

$$14\mathrm{.}60$ each. The company's purchases during July were as follows $($see image$)$

Pharoah pet shop uses a perpetual inventory system.

a$)$ Calculate the Cost of goods sold for july using the weighted average cost formula.

b$)$ Calculate the Cost of goods sold for july using the FIFO cost formula.

c$)$ Whidh of the two inventory cost formulas results in the greater gross margin for july?

d$)$Which of the two inventory formulas results in the larger inventory balance at the end of july?