Judy, a cash basis taxpayer, leases office buildings to commercial tenants. During 2015, she receive $10,000 from various tenants a refundable damage deposits, $300,000 for 2015 rents, and $50,000 for 2016 rents. How much should Judy include in 2015 gross income?
a. $300000
b. $310000
c. $350000
d. $360000