I just sold a strawberry to Marty and she said she'd give me sixty coins... now I have ninty more coins... erm? I think a bunny has gotten in there to do your maths again...
Edit: It happened again when I sold a strawberry to Marty... it appears that I am getting extra money because I am completing goals but the reward for the goal is a bunch of strawberries, not money... and only on full completion of the overall goal, no?? - Second edit: Confirmed, the extra money only turns up when you are completing a goal stage at the same time... no mention of this extra money is made so it is very confusing and would be useful to know for planning.
Also, just realised how badly my first game went since this time I wasn't required to have more than four animal pens whereas the first time I was required to have three minimum for one quest and I'd guess at least three or four more for the other unless I got sheep - which I never did...
Edit the third: My latest game was impossible - I completed everything and had almost a thousand money but the power of the RNG decided I was not to get wasabi and so the wasabi/rice quest I got was literally impossible to complete... no amount of time, money or anything else could fix the stupidity of the goals and the RNG not matching... I should say that a REAL farmer (an experienced one) would only ever need one of something to create an infinite number (given enough time and/or space). Even if you had to use the old crop to produce a new one (which isn't how that works) that would at least only require the RNG to give you one of an item to then let you stand a chance of completing the goals...