Calculation problem - Easy one?

As part of my personal Excel budget planner, I want to create a simply excel calculator to help convert my expenses from monthly to weekly to daily etc. By simply entering a figure and selecting a time period (eg weekly) from a drop down menu from the adjacent cell I want it to calculate the monthly, daily and yearly expense. attached template should help to explain what I am hoping to achieve, although it's missing the formulas to make this happen at present. Thanks for your help!