In CS $110$A$,$ we use a student's average class total and the grading scheme to determine the student's letter grade for the class. Please check the Grading Policies and Evaluation Methods section in the syllabus for the grading criteria. The students average class total will be rounded up prior to grade determination. Given the average class total, write a Python function to return the letter grade of a student in this class. For example a student with $89\mathrm{.}1$ will receive an A but a student with just $89$ will receive a B$.$ In your main function, use your function to find out the letter grades of the following students given as a dictionary, $\{\text{'}$Kate$\text{'}$: $90,$ 'Jack': $89\mathrm{.}2,$ 'Jill':$95,$ 'Ken': $69\mathrm{.}3\}.$ Note that you must use this dictionary$-$do not manually do it$.$ Do not use for loops. $90\%-100\%$ A

$80\%-89\%$ B

$70\%-79\%$ C

$60\%-69\%$ D

$0-59\%$ F