324 algebra De mystif ieD
the year would be 0.0575x. The total income from Bank B would be
25 + 0.0575x.
IncomefromBankAI≥ncomefromBankB
0 0650. x≥ 25 ++
-≥-
≥≥0 0575
0 0575 0 0575
0 0075 25
25
0 0075.
..
..x
xx
xxx≥≥3333 33.A customer would need to deposit at least $3333.33 in Bank A to earn no
less than would be earned at Bank B.PRACTICE- A scholarship administrator is using a $500,000 endowment to pur-
chase two bonds. A corporate bond pays 8% interest per year and a
safer treasury bond pays 541 % interest per year. If he needs at least
$30,000 annual interest payments, what is the least he can spend on
the corporate bond? - Kelly sells corn dogs at a state fair. Booth rental and equipment rental
total $200 per day. Each corn dog costs 35 cents to make and sells for
$2. How many corn dogs should she sell in order to have a daily profit
of at least $460? - The owner of a snow cone machine pays $200 per month to rent his
equipment and $400 per month for a stall in a flea market. Each snow
cone costs 25 cents to make and sells for $1.50. How many snow cones
does he need to sell in order to make a profit? - A tee-shirt stand can sell a certain sports tee shirt for $18. Each shirt
costs $8 in materials and labor. Monthly fixed costs are $1500. How
many tee shirts must be sold to guarantee a monthly profit of at
least $3500? - A car rental company rents a certain car for $40 per day with unlimited
mileage or $24 per day plus 80 cents per mile. What is the most a cus-
tomer can drive the car per day for the $24 option to cost no more than
the unlimited mileage option?
PRACTICE- A scholarship administrator is using a $500,000 endowment to pur-