What is business correct definition

The business correct definition
doing a work , job and earning
the profit form sales and purchase
like the man buy the lot of t-shirt.
The lot of T-shirt contain 1000 T-shirt
and in lot one T-shirt cost 1$ so price
of lot is 1000$ and he sell it for 3$
by doing marketing cost 1000$ so
expenses distribute is 1$ pre t shirt so
so simply he earn 1000$ now take out
10% for libilitys and invest 900$ in Mutual Fund which will you 90000$ now repeat this process again and again