inputs 
======
int numPackagesPurchased
constant PRICE_EACH

Process
=======
Determine fractionDiscount
Set fractionDiscount = <decision structure>
Set discountAmount = PRICE_EACH * numPackagesPurchased * fractionDiscount
Set subtotal = numPackagesPurchased * PRICE_EACH
set total = subtotal - discountAmount

Output
======
Display "The discount amount is ", discountAmount
Display "The total is ", total

---8<-----------8<--------------------------------

Constant Real PRICE_EACH = 99.0 
Declare Integer numPackagesPurchased
Declare Real fractionDiscount
Declare Real discountAmount, subtotal, total

Display "Enter quantity purchased"
Input numPackagesPurchased

Set fractionDiscount = 0.0

if numPackagesPurchased > 0 and numPackagesPurchased <= 9 then 
	fractionDiscount = 0.0
else if numPackagesPurchased >=10 and numPackagesPurchased <= 19 then
	fractionDiscount = 0.2
else if numPackagesPurchased >= 20 and numPackagesPurchased <= 49  then
	fractionDiscount = 0.3
else if numPackagesPurchased >= 50 and numPackagesPurchased <= 99 then
	fractionDiscount = 0.4
else
	fractionDiscount = 0.5
end if

Set discountAmount = PRICE_EACH * numPackagesPurchased * fractionDiscount
Set subtotal = numPackagesPurchased * PRICE_EACH
set total = subtotal - discountAmount