PSLE A company offered 200 lamps at 20% 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 200 lamps were sold in the first four days of the sale?
- During the sale, the discounted price of the lamps was $104. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 200 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 = 120
Number of lamps that were sold for the first four days
= 200 - 120
= 80
Percentage of lamps that were sold for the first four days
=
80200 x 100%
= 40%
(c)
Number of lamps that were left at the end of the sale = 50
Number of lamps that were sold during the sale
= 200 - 50
= 150
Total amount that collected from the lamps sold
= 150 x 104
= $15600
Price of each lamp after 20% discount
= 100% - 20%
= 80%
80% of the price = 104
1% of the price = 104 ÷ 80 = 1.3
100% of the price = 100 x 1.3 = 130
Amount collected from selling the remaining lamps
= 50 x 130
= $6500
Total amount collected from selling all the 200 lamps
= 15600 + 6500
= $22100
Answer(s): (a) Day 3; (b) 40%; (c) $22100