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 five days of the sale?
- During the sale, the discounted price of the lamps was $136. 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 1 to Day 2.
On Day
2, the most number of lamps was sold.
(b)
Number of lamps that were left at Day
5 = 80 Number of lamps that were sold for the first five days = 200 - 80 = 120 Percentage of lamps that were sold for the first five days
=
120200 x 100%
= 60%
(c)
Number of lamps that were left at the end of the sale = 40
Number of lamps that were sold during the sale
= 200 - 40
= 160
Total amount that collected from the lamps sold
= 160 x 136
= $21760
Price of each lamp after 20% discount
= 100% - 20%
= 80%
80% of the price = 136
1% of the price = 136 ÷ 80 = 1.7
100% of the price = 100 x 1.7 = 170
Amount collected from selling the remaining lamps
= 40 x 170
= $6800
Total amount collected from selling all the 200 lamps
= 21760 + 6800
= $28560
Answer(s): (a) Day
2; (b) 60%; (c) $28560