The interest earned by $318 investment is 9/100 x 318= $28.62
6/10 and 13/20, sorry i would explain this but its late, cheers.
Hope this Helps.
Answer:

Step-by-step explanation:



or

Im sorry Im not that good at geometry.
Jan. profit..... 5625.14
feb..loss... - 4250.35
march..profit...1475.55
add the profits and subtract the losses...if the result is positive, then the company made a profit....if the result is negative, then the company had a loss.
(5625.14 + 1475.55) - 4250.35 = 7100.69 - 4250.35 = 2850.34.....as u can see, the result ended in a positive number....so, in the 3 month period, the company made a profit of $ 2850.34 <==