AMC 8 2014 Problem 3

Isabella had a week to read a book for a school assignment. She read an average of $36$ pages per day for the first three days and an average of $44$ pages per day for the next three days. She then finished the book by reading $10$ pages on the last day. How many pages were in the book? $\textbf{(A) }240 \textbf{(B) }250 \textbf{(C) }260 \textbf{(D) }270 \textbf{(E) }280$