Conditional running total

please help on this issue. i am attaching the file with mannual input. please help how to do this with formula.

row1 is HEADER ROW, and row2 to row13 consists data

IF D13="HOLD", VALUE OF E13 WILL BE SUM OF C13 AND PREVIOUS CELL IN COLUMN C WHOSE VALUE=B13

IF D13="SOLD", VALUE OF E13 WILL BE SUBTRACT (-) OF PREVIOUS CELL IN COLUMN C WHOSE VALUE=B13 AND C13


thanks in advance.