Wowwww, disregard all this. I figured it out, it's those income statement layouts with the working on one side, and the product of the sums on the other. Just-after-school-temporary-braindeath condition.
Sales - ??
less COGS
Opening Stock - 110 000
add Purchases - 45 000 (155 000)
less Closing stock - 120 000
COGS = 35 000
Gross Profit - ??
I'm not sure this will make sense to anyway, but we'll see
Ahh okay, I have a worksheet that gives an income statement - Gross profit and sales (revenue) are blank, but everything inbetween is there, I have no idea how to work it backwards to find sales.