Question

Why might a mattress store choose to advertise new mattresses, worth $1,000, as $50 per week for 22 weeks?

Answer 1

$50 per week is more affordable to most people than $1000 up front. So the customer is more likely to buy it, and the store ends up 50*22 = $1100, so $100 more (which might seem worth it for the customer if they get to pay it over 22 weeks).

Some people might also be enticed by the low price of $50 and think its cheaper.