I know that the left hand side upgrade for banana farm is the research facility which produces a lot of bananas while the investment bank gives interest. So, which one is more cost-efficient given very little space in the map? I'm going for approximately 100 rounds or so.
Which upgrade path for banana farm is better? Left or Right
bloons-td-5
Best Answer
It depends on the situation.
The 2|4 farm is cheaper, and can be bought and paid back sooner. In fact, it's $7500 cheaper than a 4|2. It produces $1180 each round with a 20% interest rate after the round, which is a little bit more than half what the 4|2 produces, but, after 7 rounds after acquisition (assuming you haven't withdrawn) it will have payed itself back and produce $2300. The 2|4 will pay for itself sooner, however, the funds are not as sufficient as the 4|2.
The 4|2 farm is a lot more expensive, and cannot be paid back as fast, but if it is purchased early on, it can have a positive effect on gameplay. After the same 7 rounds, it will be $2400 short of paying itself back, but it produces a constant $3000 each round wich quickly adds up and will be very beneficial for late-round gameplay.
In short, The 2|4 farm is for short term investments, and the 4|2 farm is for long term investments. The 2|4 will produce some quickly, the 4|2 will produce more after a longer period of time. I personally prefer the 2|4, but this site is for answers, not discussions.