3400 is the quotation of Shanghai and Shenzhen 300 contracts in March 1.
3500 is the quotation of September 17 of the CSI 300 contract.
-The answer to 5280000 is wrong.
-5280000=(3324-3500)*300* 100
When substituting into the formula, the spot price of 3324 is mistaken for the quotation of futures CSI 300 contract.