Pls help and show workings

The gades foundation and hbm corporation are eager to donate generously to their favorite charities. the gades foundation donated $250 in the first month, and each month afterward their cumulative donation total increases by 100$ the hbm corporation donated $64, in the first month, and each month afterward their cumulative donation total increases by 75%. in which month will the hbm corporation's cumulative donation total first exceed the gades foundations' cumulative donation total?

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us