A Company Provides Residential Carpet Cleaning at a Rate of $24

A company provides residential carpet cleaning at a rate of $24 per month or $250 per year if paid one year in advance. Examination of the bank deposits revealed the following: $\begin{array}{|l|l|}\hline \text { Cash collected from customers during the year (including advances) } & \$ 16,000 \\\hline \text { Advances from customers } 1 / 1 & 2,000 \\\hline \text { Advances from customers } 12 / 31 & 2,600 \\\hline \text { Accounts receivable } 1 / 1 & 10,400 \\\hline \text { Accounts receivable } 12 / 31 & 9,600 \\\hline\end{array}$ Revenue for the year was $__________________.