OG11-PS1

A projet scheduled to be carried out over a singhled fiscal year has budget of $12600, divided into 12 equal monthly allocations. At the end of the fourth month of that fiscal year, the total aount actually spent on the project was $4580, by how much was the project over its budget?
A $380
B $540
C$1050
D$1380
E$1430
答案A 請問黃色話線部分的翻譯是什麼我理解成只有第四個月花了$4580... 12600除12個月用4580-1050 哪裡不對了呢