Question $1$: Create a program that converts number grades to letter grades. Use the screenshot below as a reference.

$(15$ pts$.)$

$```$

Letter Grade Converter

Enter numerical grade: $90$

Letter grade: A

Continue? $($y$/$n$)$: y

Enter numerical grade: $8$

Letter grade: A

$```$

Continue? $\backslash ((\backslash$mathrm$\{$y$\}/\backslash$mathrm$\{$n$\})$: $\backslash$mathrm$\{$n$\}\backslash )$

Bye!

$(1$a$)$ In a loop structure, use the following grading criteria. $(10$ pts$.)$

$-$ A: $88-100$; B: $80-87$; C: $67-79$; D: $60-66$; F: $<mn>6</mn><mn>0</mn>$

$($lb$)$ Ask the user to enter a number grade via a prompt. Assume the user will enter valid data. $(2$ pts $.)$

$(1$c$)$ The program should continue only if the user enters $"$ y $"$ or $"$Y$"$ to continue. $(3$ pts$.)$