Personal budget

At the beginning of the school year, Craig Kovar decided to prepare a cash budget for the months of September, October, November, and December. The budget must plan for enough cash on December $31$ to pay the spring semester tuition, which is the same as the fall tuition. The following information relates to the budget:

$\backslash$table$[[$Cash balance, September $1($from a summer job$),$$$6,780$