PSLE A company offered 100 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 100 lamps were sold in the first five days of the sale?
- During the sale, the discounted price of the lamps was $171. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 100 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 = 45 Number of lamps that were sold for the first five days = 100 - 45 = 55 Percentage of lamps that were sold for the first five days
=
55100 x 100%
= 55%
(c)
Number of lamps that were left at the end of the sale = 25
Number of lamps that were sold during the sale
= 100 - 25
= 75
Total amount that collected from the lamps sold
= 75 x 171
= $12825
Price of each lamp after 10% discount
= 100% - 10%
= 90%
90% of the price = 171
1% of the price = 171 ÷ 90 = 1.9
100% of the price = 100 x 1.9 = 190
Amount collected from selling the remaining lamps
= 25 x 190
= $4750
Total amount collected from selling all the 100 lamps
= 12825 + 4750
= $17575
Answer(s): (a) Day
2; (b) 55%; (c) $17575