You are a famous TikToker and you are looking to start your own line of customized mugs. You found investors, but since you are new to the mug market, they would like to see a rate of return of 10% after 1 year, or they will pull their funding. At the beginning of September, they invest $80,000 in your brand. Your monthly expenses for materials, packaging, etc. is $6,000. Marketing costs are $1,200 monthly. Your profit starts at $10,000 a month, but increases by 8% monthly. Determine what rate of return you would achieve. Assume that expenses begin in October and lasts for 12 months, while income is first generated in November and lasts for 12 months.