Soon after December $31,2018,$ the auditor of Morino Manufacturing Corp. asked the company to prepare a depreciation schedule for semi$-$trucks that showed the additions, retirements, depreciation and other data that affected the company's income in the $4$ year period from $2015$ to $2018$ inclusive. The following data was obtained:

Balance of Semi$-$Trucks account at January $1,2015$

$\backslash$table$[[$Truck #$1$ purchased Jan $1,2012,$$$18,000$