PSLE
A company offered $(dn0) stand mixers at 20% discount during a 7-day sale. The line graph shows the number of stand mixers left unsold at the end of each day.

1. On which day was the most number of stand mixers sold? Give your answer in this format. (Eg Day 1)
2. What percentage of the 80 stand mixers were sold in the first six days of the sale?
3. During the sale, the discounted price of the stand mixers was $152. After the sale, the remaining stand mixers were sold without discount. What was the total amount of money collected from selling all 80 stand mixers?

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

On Day 4, the most number of stand mixers was sold.

(b)
Number of stand mixers that were left at Day 6 = 16

Number of stand mixers that were sold for the first six days
= 80 - 16
= 64

Percentage of stand mixers that were sold for the first six days
= ⁶⁴₈₀ x 100%
= 80%

(c)
Number of stand mixers that were left at the end of the sale = 12

Number of stand mixers that were sold during the sale
= 80 - 12
= 68

Total amount that collected from the stand mixers sold
= 68 x 152
= $10336

Price of each stand mixer after 20% discount 
= 100% - 20%
= 80%

80% of the price = 152
1% of the price = 152 ÷ 80 = 1.9
100% of the price = 100 x 1.9 = 190

Amount collected from selling the remaining stand mixers
= 12 x 190
= $2280

Total amount collected from selling all the 80 stand mixers
= 10336 + 2280
= $12616

Answer(s): (a) Day 4; (b) 80%; (c) $12616