Determine using pascal's method. (2p-3q)^5=(p-q)^5​

Marissa can buy 3 oranges for $1.35 4 oranges for $.80 or 5 oranges for $2.25 marissa can buy 10 oranges for a price that fits this pattern or a bag of oranges for $4.25 which way costs less for 10 oranges