Mavis is paid a salary of $49,620 per year. Work out a rough estimate for her weekly pay. (Give your answer to one significant figure.)

well that is pretty close to $52,000  and there are 52 weeks in a year (plus a 1 and a bit days)

52000/52 = $1000      So that is my estimate  :)

check:

$${\frac{{\mathtt{49\,620}}}{{\mathtt{52.177}}}} = {\mathtt{950.993\: \!732\: \!870\: \!805\: \!144}}$$

which is  $1000 to one significant figure.  :)