Please help me on this word problem.?

Jake stores a small cache of 4-inch diameter snow in the basement freezer, unaware that the freezer's self defrosting feature will cause each snowball to lose about 1 cubic inch of volume every 40 days. He remembers them a year later (about 360 days) and goes to retrieve them. What is their diameter then? Round answer to the nearest 1/10th please.