idk what kind of math problem but, if its just simple id us PEMDAS
To rock to the nearest ten and hundred if his 15 or of your round on time if it's less you round down same with the hundreds like if it's 150 rooms and it's all so different with decimals
1,75% = 0,0175
per month: 0,0175/12 = 0,00145833
500*0,00145833 = 0,73$ interest
12 times 35 times 28= 980..... im not sure
