PSLE A company offered 100 speakers at 30% 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 100 speakers were sold in the first four days of the sale?
- During the sale, the discounted price of the speakers was $7. After the sale, the remaining speakers were sold without discount. What was the total amount of money collected from selling all 100 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 = 50
Number of speakers that were sold for the first four days
= 100 - 50
= 50
Percentage of speakers that were sold for the first four days
=
50100 x 100%
= 50%
(c)
Number of speakers that were left at the end of the sale = 10
Number of speakers that were sold during the sale
= 100 - 10
= 90
Total amount that collected from the speakers sold
= 90 x 7
= $630
Price of each speaker after 30% discount
= 100% - 30%
= 70%
70% of the price = 7
1% of the price = 7 ÷ 70 = 0.1
100% of the price = 100 x 0.1 = 10
Amount collected from selling the remaining speakers
= 10 x 10
= $100
Total amount collected from selling all the 100 speakers
= 630 + 100
= $730
Answer(s): (a) Day 3; (b) 50%; (c) $730