I am answering according to my understanding!

In 1st situation manager is entitled for commission @ 10% but after charging such commision profit will be 2000. Therefore, 2000 is 90% of total,so divide 2000 by 90% you have the actual figure before commission.i.e; 2222 so 10%of 2222is 222. therefore 222 is the amount of commission.

2nd method u can addopt is to divide 10 by 90 and multiply with 2000, then u will get the answer.

Ur second question is wrong or something is missing, what is 3320. Is it profit or any other value?