Question 19

A coffee shop is known to be able to sell 200 cups of iced coffee in a normal day at a price of $\text{Rp}12,000.00$ per cup. After conducting various surveys, the coffee shop owner concludes that for every decrease in the price of iced coffee by $\text{Rp}1,000.00$, the number of iced coffees sold will increase by 20 cups per day. In order not to lose money, the minimum daily income of the shop is $\text{Rp}2,100,000.00$ to cover the shop's operational costs.

The number of iced coffees sold per day when the price of iced coffee becomes $\text{Rp}9,000.00$ is ....