Please hep me :( i really need help i will give u :D

Step-by-step explanation:

80 ml bottle for 55 : 55/80= 11/6=0.6875

50 ml bottle the price ( buy one get half price off the second one) :

45+(45*50%)=67.5 for two bottles

price per ml for 50ml bottle: 67.5/100=0.675

comparing prices : 0.675 is less than 0.6875

it is better to buy 50 ml bottle

not a big difference

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

6/20

step-by-step explanation: