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Speaking of specific prices, Grant quickly realized that there was one small issue
that he hadn't dealt with yet. He hadn't had a chance to think about how much his
products should cost. I randomly picked the numbers $5 for wipers and $3 for a
nozzle but he's probably going to want to make a little bit more money than that.
For some reason, his friends who had promised to buy his products didn't seem
particularly worried about how much they would cost. But he wanted to get closer to
crunching some numbers so he could figure out what kind of fortune his Gleaming
Glasses products would give him. So right now, we have this very general equation
that we came up with in the last quiz for the total amount of money that Grant's
going to make, but as we can see there aren't any numbers in this yet. What we
want to do is get the actual price of each product to be involved in this equation in
some way. So what other information do we already have about this situation? Well,
we learned that 36 people want to buy glasses wipers. We also know that 11
people each want two nozzles. What we don't know yet, is the price that Grant
should set for each product, a set of wipers and one nozzle. Similar to what we
did before, let's pick one variable to represent the cost per wiper set and
another variable to represent the cost per nozzle. I think I'll pick w to represent
the cost per wiper set and I'll pick n to represent the price per nozzle. Looking
back up at this equation we came up with in the last quiz, let's just start by
focusing on the amount of money that Grant's going to earn from selling wiper
sets. So for now, we're just going to ignore the part of the equation about the
nozzles. So, which of these expressions down here do you think should replace this
question mark? How much money is Grant going to earn from selling wipers to 36 friends?