A sports shop had 450 ping pong balls for sale. Each ping pong ball is sold at $3. At the end of each day, the number of ping pong balls sold was recorded in the bar graph shown.
- What fraction of the total number of ping pong balls was left at the end of Day 3? Express your answer in its simplest form.
- If the shop decided to sell every 3 ping pong balls at $6 from Day 4 onwards, how much less would it collect from the sale of the ping pong balls?
(a)
Number of ping pong balls left at the end of Day 3
= 450 - 39 - 48 - 42
= 321
Fraction of ping pong balls left at the end of Day 3
=
321450=
107150 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 54 + 39 + 51
= 144
Amount that it would collect if it sold the 144 ping pong balls at the original price
= 144 x 3
= $432
Number of sets of 3 ping pong balls
= 144 ÷ 3
= 48
Amount that it would collect if it sold the 144 ping pong balls at every 3 ping pong balls at $6
= 48 x 6
= $288
Amount that it would collect less from the sale of the ping pong balls
= 432 - 288
= $144
Answer(s): (a)
107150; (b) $144