# Independent answer check

The initial three values total $800. After adding April $400 in row 5, the expected four-month total is $1,200 and the chart must show April as its fourth category at $400. A chart that still ends in March fails the check.

Independent arithmetic: 200 + 350 + 250 = 800; 800 + 400 = 1,200. Expected source row count changes from 3 to 4.