Create hypergrowth calculator

Why is this change being made?

The hypergrowth pages are complicated and the concepts would benefit from a calculator.

If the review app is running, here's a direct link to the hypergrowth page.

• Make the calculator
• Update the example formula with calculated lever
• Make all target percentages variable

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what