Answer:
The cost of the old ball was $100.
Step-by-step explanation:
The cost of the new ball = $300
The new ball has three times the price of his old ball.
So, let the price of the old ball be = x
As per situation, we get the equation:

Dividing both sides by 3:

=> x = 100
Hence, the cost of the old ball was $100.
First find the amount of containers:
6.3 kg/0.35 kg
=18 containers
Now we can find the amount of money earned:
18 containersx$2.99
=$53.82
Bella will earn $53.82 if she sells all the containers.
Ben mixed up the first two #s. he needs to make the 6 a 5 and 5 a 6