Section B: $80$ Marks

Show all your work.

Task $1$ : Landscaping a backyard

You are planning on having some pave$-$uni installed in your backyard.

You have spoken to two companies regarding the cost to have your yard landscaped

Company A

Charges according to the following equation

$f(x)=200[\frac{x}{20}]+k,$ Where the minimum cost $togo$ onsite $is200$$

Company B

Charges according to a square root function according to the following table, where $150$$ is the minimum

You decide to analyze the cost. For which size of area would it be beneficial to hire Company $A.$

$f(x)=200[\frac{x}{20}]+x$