help!

There are two containers of pentanut oil, the normal size and the jumbo size. The volume of the normal size is less than that of the jumbo size by 40% and the difference in volume is 600 ml.
(a) Find the volume of the normal size.
(b) If the volume of the normal size is increased by 5%, find its new volume.
(a)
let the volume of the jumbo size is x, then the volume of the jumbo size is 0.6x
the difference in volume is 600 ml
so (x-0.6x)=600
0.4x=600
x=1500
the volume of the normal size
=1500*0.6
=900
(b)
the volume of the normal size is increased by 5%, find its new volume
=900*(1+0.05)
=945