Can you check my math on the following question

The average price of homes sold in the medium size city in Canada in the past year was $220,000.A random sample of 81 homes sold this year showed an average price of $210,000 with a sample standard deviation of $36,000.Determine whether there has been a significant decrease in the average price of homes.

Compute the test statistic

t = (220,000 - 210,000) - 0 / square 36,000/81 + 36,000/81

t = 10,000/29.814

t = 335.41289