How much money do you have to spend on your project? It's important to build your own mining farm.
What kind of altcoins do you want to mine? Do you prefer to mine bitcoin as well?
How much the cost of electricity costs in your city?
Why you offer $25 investment? It's a small amount for mining.
if someone invests $100, it means he will get $20 in 5 months, right?
Consider this; if I buy bitcoin right now and hold it for 5 months, I will get profits more than $20 for sure.