Definition: You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.
Input: At the hardware store, 0.2 the nails are size 2d and 0.5 the nails are size 4d. What fraction of the nails are either size 2d or 4d?

0.7