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.

At the beach, Miki and her sister both built sandcastles and then measured their heights. Miki's sandcastle was 0.83 foot tall and her sister's was 0.53 foot tall. How much taller was Miki's sandcastle than her sister's?
0.3