If its meaning making a profit after the $300 then:
540+300=840
840/24= 33.60
They would charge $33.60 per necklace.
If you were meaning a profit of $540 total then:
540/24=22.5
They would charge $22.50 per necklace.
Answer:
a. 2.5..... I believe but you should get other answers
David would have to save for 7 weeks in order to have enough money for his bike.
