PSLE A company offered 80 lamps at 30% discount during a 7-day sale. The line graph shows the number of lamps left unsold at the end of each day.
- On which day was the most number of lamps sold? Give your answer in this format. (Eg Day 1)
- What percentage of the 80 lamps were sold in the first four days of the sale?
- During the sale, the discounted price of the lamps was $21. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 80 lamps?
(a)
The steepest line is from Day 2 to Day 3.
On Day 3, the most number of lamps was sold.
(b)
Number of lamps that were left at Day 4 = 36
Number of lamps that were sold for the first four days
= 80 - 36
= 44
Percentage of lamps that were sold for the first four days
=
4480 x 100%
= 55%
(c)
Number of lamps that were left at the end of the sale = 16
Number of lamps that were sold during the sale
= 80 - 16
= 64
Total amount that collected from the lamps sold
= 64 x 21
= $1344
Price of each lamp after 30% discount
= 100% - 30%
= 70%
70% of the price = 21
1% of the price = 21 ÷ 70 = 0.3
100% of the price = 100 x 0.3 = 30
Amount collected from selling the remaining lamps
= 16 x 30
= $480
Total amount collected from selling all the 80 lamps
= 1344 + 480
= $1824
Answer(s): (a) Day 3; (b) 55%; (c) $1824