Shell Script to calculate bonus according to salary in Linux Shell Scripting

Question

[If Salary >= 5000 then bonus = 5% of Salary
Print Bonus
If Salary < 5000 then bonus = 3% of Salary
Print Bonus
If Salary <= 10000 and >=8000 then bonus = 7% of salary
print Bonus]

Code:

echo "Enter a Salary"
read num

if [ $num -gt 5000 ]

then
percentage=$((num*5/100))
echo "The 5 Percent of Salary is: $percentage"

elif [ $num -lt 5000 ]
then
percentage=$((num*3/100))
echo "The 3 Percent of Salary is $percentage"

else
echo "The 7 Percent of Salary is $percentage*7/100"

fi