Consider this conversation between two work colleagues:

Carole: Hey Fong, what did you say you needed these other selling prices for again?

Fong: I$\text{'}$m trying to figure out if my potential customers will be willing to pay what I want to charge for my clever upgrade to plastic storage containers.

Carole: Oh$,$ wow, that sounds super exciting; thanks for including me in this analysis.

Fong: You just wait, Carole. I$\text{'}$m going to make a dent in this market, and then we'll see who retires at age $45!$

Carole gathered the following selling price information about other plastic storage containers on the market.

Competitor $913$ Plastic Containers with Lid

$$12,$ lid fits tightly but is not spill$-$proof

$$15,$ lid is spill$-$proof but snaps on loudly

$$10,$ lid just rests on top so is not tight$-$fitting

However, without access to competitors' internal records, she could not determine their costs.

Meanwhile, Fong made note of his production costs and secretly smiled to himself as he thought about what a great idea he had. He wants to make plastic storage containers that have a locking lid. More than that, the lid locks quietly, so no one knows you're sneaking a treat from the container $($yes$,$ Fong got busted stealing Carole's famous chocolate cookies, and he vowed to fix this problem permanently$).$ Here's his estimated costs to produce and sell one $913$ plastic container with quiet, spill$-$proof lid:

DM $$5$

DL

$5$