Hi

I am studying shell scripting and running below script on RH Ent 3 Linux, however it is giving error. I have written script in Vi editor.

Programme condition :
If employe's basic salary is less then Rs. 1500, then HRA = 10% of basic salary and DA=90% of basic salary. If his salary is either equal to or above Rs.1500, then HRA=Rs. 500 and DA =98% of basic salary. Write a program to find gross salary.

Script:
# Calculate the gross salary of employee
echo Enter basic salary \?
read bs
if $bs -lt 1500
then
hra='echo $bs \* 10/100 | bc'
da='echo $bs \* 90/100 | bc'
else
hra=500
da='echo $bs \* 98/100 | bc'
fi
gross='echo $bs + $hra + $da | bc'
echo gross salary is $gross

Error:
./salary: line 5: 1000: command not found
gross salary is echo $bs + $hra + $da | bc

i have tried different command at line number 5. like
if [$bs -lt 1500]
if $bs < 1500
if [$bs -lt 1500]

Please suggest.