30 ipods were up for sale at the local electronic store. the store owner sold the first 20 ipods for at least $15 and he sold the next 9 ipods for at least $20. if the owner made a total revenue of $600 by selling these 30 ipods, how much must he have sold the last ipod for?

Allie and sarah decided that they want to purchase renters insurance for the apartment they share. they made a list of all of the items to be covered by the insurance policy, along with their estimated values. if the items to be covered total more than $3000, the insurance company charges an annual premium of 23% of the total value of the items. if the items to be covered total $3000 or less, the insurance company charges an annual premium of 20% of the total value of the items.