Please help with this question

Step-by-step explanation:

Price of two 50 ml bottle = 45 + (45/2)

                                         = 45 + 22.5

                                        = £ 67.50

100 ml = 67.50

Price per 1 ml = 67.50/100 = £ 0.675

Price of 80 ml  bottle = £ 55

80 m l = £ 55

Price per 1 ml = 55/80 = £0.6875

So, buying two 50 ml bottle  is the best value for money

i have no clue at all sorry

step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.