PSLE
A company offered $(dn0) slow cookers at 40% discount during a 7-day sale. The line graph shows the number of slow cookers left unsold at the end of each day.

1. On which day was the most number of slow cookers sold? Give your answer in this format. (Eg Day 1)
2. What percentage of the 80 slow cookers were sold in the first six days of the sale?
3. During the sale, the discounted price of the slow cookers was $108. After the sale, the remaining slow cookers were sold without discount. What was the total amount of money collected from selling all 80 slow cookers?

(a)
Steepest line is from Day 3 to Day 4.

On Day 4, the most number of slow cookers was sold.

(b)
Number of slow cookers that were left at Day 6 = 20

Number of slow cookers that were sold for the first six days
= 80 - 20
= 60

Percentage of slow cookers that were sold for the first six days
= ⁶⁰₈₀ x 100%
= 75%

(c)
Number of slow cookers that were left at the end of the sale = 12

Number of slow cookers that were sold during the sale
= 80 - 12
= 68

Total amount that collected from the slow cookers sold
= 68 x 108
= $7344

Price of each slow cooker after 40% discount 
= 100% - 40%
= 60%

60% of the price = 108
1% of the price = 108 ÷ 60 = 1.8
100% of the price = 100 x 1.8 = 180

Amount collected from selling the remaining slow cookers
= 12 x 180
= $2160

Total amount collected from selling all the 80 slow cookers
= 7344 + 2160
= $9504

Answer(s): (a) Day 4; (b) 75%; (c) $9504