Chapter 1, Problem 18PP

Express the answers to the following operations with the proper number of significant figures:

$\begin{array}{l}\text{(a) }1.003+1.02+1.0\\ \text{(b) }1.0003-0.10\\ \text{(c) }2.5020-2.50\\ \text{(d) }7.10+13.473\end{array}$