Zen Company wants to open a new spa in a nearby plaza. Zen Company will be offering half$-$day spa treatments for $$140$ each. Variable costs

$($not including the leasing costs below$)$ are $$56$ for every treatment.

In terms of lease payments, the plaza has provided him three options:

i$.$ Pay $$37$ per treatment given

ii$.$ $$17,000$ per month

iii. $$13,000$ per month and $$5$ per treatment given

Do not enter dollar signs or commas in the input boxes.

Use the negative sign for negative values.

Round all answers to the nearest whole number.

a$)$ Calculate the monthly operating profit for each of the three options if $300$ treatments are given and if $620$ treatments are given.

b$)$ At a level of $620$ massages, which option should be recommended?

Option:

c$)$ Calculate the degree of operating leverage for the second lease option if Zen Company gives $620$ treatments.

Round your answer to $2$ decimal places.

Degree of Operating Leverage: