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.

[EX Q]: Greg and Sharon own neighboring cornfields. Greg harvested 0.4 acreof corn on Monday and Sharon harvested 0.1 acre. How many moreacres did Greg harvest than Sharon?
[EX A]: 0.3

[EX Q]: Mike found 6 seashells and 4 starfish, but 4 of the seashells werebroken. How many unbroken seashells did Mike find?
[EX A]: 2.0

[EX Q]: Jason joined his school's band. He bought a flute for $142.51, amusic tool for $8.89, and a song book for $7. How much did Jasonspend at the music store?
[EX A]:
158.4