keeping in mind that the interest is accumulated as time passes by, so "at the beginning of the 11th year", we're in the 11th year, just beginning, however, only 10 years have passed by, so after 10 years then.
to find the volume its length time width times heights; so 4 cm times 4 cm time 4 cm which is 64. Since the dice are the same size you add 64 cm^3 to 64 cm^3 to get 128 cm^3