Today is $1$ January $2024.$ Ella used $$200,000$ to purchase a florist business in Sydney. To operate this business, Ella needs to pay rent, maintenance costs, and labor costs. Here are the details:

Rent will be paid by the end of each month with an amount of $$2,000.$

Labor cojit will be paid by the end of each month with an amount of $$10,000.$

Maintenance cost will be paid by the end of each quarter with an amount of $$500.$

Ella predicts that this florist franchise initially can have monthly revenue of $$13,000.$ Assume that Ella can obtain this amount by the end of each month. Ella forecasts that this revenue amount will increase at the rate of $y\%$ p$.$a$.$ The revenue increase will only happen at the beginning of each year. For example, this florist franchise initially has monthly revenue of $$13,000$ in $2024.$ Then the revenue amount will become $$13,000(1+y\%)$ per month in $2025$ and $$13,000(1+y\%{)}^2$ per month in $2026.$

Ella plans to run this business for three years and predicts that she can sell this business on $1$ January $2027$ with an amount of $$240,000.$

a$.$ Calculate the monthly net cash flows. Assume that Ella can reinvest all profit at a rate of $4\mathrm{.}5\%$ p$.$a$.$ Use Goal Seek to find revenue increasing rate $y\%$ p$.$a$.$ if Ella requires a holding period yield rate of $7\mathrm{.}5\%$ p$.$a$.$ for this investment $($from $1$ January $2024$ to $1$ January $2027).$ Label this sheet as "Part a$".$