PSLE A company offered 150 speakers at 20% discount during a 7-day sale. The line graph shows the number of speakers left unsold at the end of each day.
- On which day was the most number of speakers sold? Give your answer in this format. (Eg Day 1)
- What percentage of the 150 speakers were sold in the first four days of the sale?
- During the sale, the discounted price of the speakers was $96. After the sale, the remaining speakers were sold without discount. What was the total amount of money collected from selling all 150 speakers?
(a)
The steepest line is from Day 2 to Day 3.
On Day 3, the most number of speakers was sold.
(b)
Number of speakers that were left at Day 4 = 60
Number of speakers that were sold for the first four days
= 150 - 60
= 90
Percentage of speakers that were sold for the first four days
=
90150 x 100%
= 60%
(c)
Number of speakers that were left at the end of the sale = 10
Number of speakers that were sold during the sale
= 150 - 10
= 140
Total amount that collected from the speakers sold
= 140 x 96
= $13440
Price of each speaker after 20% discount
= 100% - 20%
= 80%
80% of the price = 96
1% of the price = 96 ÷ 80 = 1.2
100% of the price = 100 x 1.2 = 120
Amount collected from selling the remaining speakers
= 10 x 120
= $1200
Total amount collected from selling all the 150 speakers
= 13440 + 1200
= $14640
Answer(s): (a) Day 3; (b) 60%; (c) $14640