Chapter 1, Problem 24P

Perform the following operations to hundredths-place accuracy:

1. $\frac{2000}{0.00008}$
2. $\frac{0.004}{4\times {10}^6}$
3. $\frac{0.000220}{0.00005}$
4. $\frac{78\times {10}^{18}}{4\times {10}^{-6}}$