A store gives a 15% discount to customers who are at least 55 years old, and a 10% discount to all other customers. Using only the instructions shown in Figure 1-9, write an algorithm that displays the amount of money a customer owes. Be sure to indent the instructions appropriately. 

Figure 1-9

calculate the amount due by subtracting the discount from the sales amount
calculate the discount by multiplying the sales amount by 10%
calculate the discount by multiplying the sales amount by 15%
display the amount due
else
end if
enter the customer’s age and the sales amount
if (the customer’s age is less than 55)