8.4-0.02 =
Explain your steps.show work

The answer is 8.38 and I’ll comment the steps

 The amount of paint has to do with surface area, which is the 'scale factor' squared. 
The ratio of the volumes is the 'scale factor' cubed. 

(The term scale factor is the ratio of a pair of corresponding sides of the similar figures). 

(Scale factor)² = 6/4 = 3/2 
Scale factor = √3 / √2 

Volume ratio = (√3 / √2)³ = 3√3 / 2√2 

SInce 3√3 / 2√2 = 1.837, this implies the larger chest is 83.7% larger in volume than the smaller (i.e., "184% of the smaller")