Life cycle costing MCQ

A company has produced the following information for a product it is about to launch:
20X4 20X5 20X6

Units 2,000 5,000 7,000

Variable production cost per unit $2.30 $1.80 $1.20

Fixed production costs $3,000 $3,500 $4,000

Variable selling cost per unit $0.50 $0.40 $0.40

Fixed selling costs $1,500 $1,600 $1,600

Administrative costs $700 $700 $700

What is the life-cycle cost per unit (to two decimal places)?
Ans: ______________

GOOD DAY Sir,
The answer in the kit says 3.22.

Which is correct and i also got it right, but then i do it other way what if we make the fixed production ,selling and admin cost to per unit and then add up the total per unit cost, but it sums up to 11.26 which is wrong i wanna know whats the math/concept behind it
Thank you