A farmer is getting himself a new car and is really annoyed about the prices for the "optional extras" added onto the base models price. A little while later one of the directors of the car manufacturer buys a cow from the farmer for his holiday farm. This is the invoice the manufacturer received:

1 Cow, base model $4800.00

Optional Extras:

Two Colours (black & white) $300.00

Leather upholstery $200.00

Milk container for all year use $100.00

4 Taps @ $25.00 , $100.00

2 Fenders, hornplated @ $35.00. $70.00

Flyswat, halfautomatic, $60.00

Fertilizer plant (biological) $120.00

Permanent 4x4 $200.00

Two circuit brake system (front & rear) $800.00

Multitone horn $270.00

Auto-shut halogen spots $300.00

Multifuel engine $2.500.00

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Total basic model plus extras: $9820.00

(Price exclusive of VAT and delivery costs)