$workshop_var = (sqrt($workshops)*$workshops);

$percentage = ($workshop_var*$egypt);
$home_cost = 2500-($percentage)+($homes*100);
$barracks_cost = 5000-($percentage)+($barracks*100);
$lab_cost = 3500-($percentage)+($labs*100);
$workshop_cost = 8000+($workshops*100);
$farm_cost = 3000-($percentage)+($farms*100);