You are assigned the task of buying cabinets for a large storage room. The cabinets come in two styles, A and B. Here are the details: Cabinet A costs $100, takes up 6 m² of floor space and has a storage volume of 9 m³; Cabinet B costs $200, takes up 8 m² of floor space and has a storage volume of 13 m³. You have $1000 to spend and 48 m² of available floor space. How many units of each style should you buy in order to maximize the storage volume? Enter the number of units of A and the number of units of B (in that order) into the answer box below, separated with a comma.

An herbalist has 30 oz of herbs costing $3 per ounce. How many ounces of herbs costing $2 per ounce should be mixed with these 30 oz of herbs to produce a mixture costing $2.40 per ounce?

A farmer wants to replace some of the fences on a farm. The wooden rail fence costs about $50 for wood and $40 for labor to install a fence that is 12 feet long. His son estimated he would need 264 feet of new fence. However, when the farmer measured he realized he would only need 204 new feet of fence. What is the difference in cost of the son's estimate versus the farmer's estimate with regard to how many feet of fence are needed? The difference in cost of the son's estimate and the farmer's estimate is $