Answer:
To calculate the profit or loss gained by Elizabeth, we need to consider the revenue and expenses associated with selling the apples.
First, let's calculate the total revenue from selling the apples:
On the first day, 30% of 520 apples were sold, which is 0.3 x 520 = 156 apples.
On the second day, 195 apples were sold.
On the third day, the remaining apples were sold, which is 520 - 156 - 195 = 169 apples.
The total revenue is then calculated as follows:
Revenue = (Quantity sold on the first day x Price per apple) + (Quantity sold on the second day x Price per apple) + (Quantity sold on the third day x Price per apple)
Revenue = (156 x RM2.10) + (195 x RM2.10) + (169 x RM2.10)
Revenue = RM327.60 + RM409.50 + RM355.90
Revenue = RM1,093
Next, let's calculate the total expenses:
Since Elizabeth rented the stall for three days, the total rental fee is 3 x RM12 = RM36.
Now, let's calculate the cost of purchasing the apples:
The cost per apple is given as RM0.75, and the total number of apples is 520.
Cost of purchasing apples = Cost per apple x Quantity of apples
Cost of purchasing apples = RM0.75 x 520
Cost of purchasing apples = RM390
Finally, we can calculate the profit or loss:
Profit or Loss = Revenue - (Expenses + Cost of purchasing apples)
Profit or Loss = RM1,093 - (RM36 + RM390)
Profit or Loss = RM1,093 - RM426
Profit or Loss = RM667
Therefore, Elizabeth gained a profit of RM667 by selling the apples.