PSLE A company offered $(dn0) lamps at 10% 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 six days of the sale?
- During the sale, the discounted price of the lamps was $45. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 200 lamps?
(a)
Steepest line is from Day 3 to Day 4.
On Da
y 4, the most number of lamps was sold. (b) Number of lamps that were left at Day 6 = 40 Number of lamps that were sold for the first six days = 200 - 40 = 160 Percentage of lamps that were sold for the first six days = 160200 x 100% = 80%
(c)
Number of lamps that were left at the end of the sale = 20
Number of lamps that were sold during the sale
= 200 - 20
= 180
Total amount that collected from the lamps sold
= 180 x 45
= $8100
Price of each lamp after 10% discount
= 100% - 10%
= 90%
90% of the price = 45
1% of the price = 45 ÷ 90 = 0.5
100% of the price = 100 x 0.5 = 50
Amount collected from selling the remaining lamps
= 20 x 50
= $1000
Total amount collected from selling all the 200 lamps
= 8100 + 1000
= $9100
Answer(s): (a) Day 4; (b) 80%; (c) $9100