On April 1, 2015, Pine Construciton Company entered into a fixed price contract to construct an apartment building for $6,000,000. Oine will satisfy the performance obligation in the contract over time and appropriately accounts for this contract. Information relating to the contract is as follows:

At December 31, 2017 At December 31, 2018

Percentage of Completion 20% 60%

Estimated costs at completion $4,500,000 $4,800,000

Gross profit recognized (Cumulative) $300,000 $720,000

What is the amount of contract costs incurred during the year ended December 31, 2018?