Back in the day of analog recording tape, Amalgamated Grissom Enterprises had a sale. Professional quality tape dropped from $30 to $28 per reel, and regular quality tape dropped from $24 to $23 per reel. The Bethel Recording Studio normally spent $1440 per week on tape, 3/4 of which was used for professional quality tape. How much did they save during each week of the sale?
Bethel Recording Studio normally spent 3/4 of $1440, or $1080, per week on professional quality tape. At $30 per reel, they bought 36 reels per week.
They spent the remaining $360 on 15 regular quality reels per week.
Since they saved $2 per reel on the professional quality tape and $1 per reel on regular quality tape, they saved 2(36) + 1(15) = 72 + 15 = 87 dollars per week during the sale.