Also the 90 day value is incorrect:

SE is calculating the price reduction from the original price instead of the current price.

Formula: OriginalPrice-(OriginalPrice*0.0014*days*reductionsPerday)

8000000-(8000000*0.0014*10*4)=7552000
8000000-(8000000*0.0014*15*4)=7328000
8000000-(8000000*0.0014*30*4)=6656000
8000000-(8000000*0.0014*90*4)=3968000