reset
set border
# set xtics 1
# set ytics 1
set grid
set xzeroaxis lt 9 lw 2
set yzeroaxis lt 9 lw 2
set style line 1 lt -1 lw 3
set style line 2 lt 5 lw 3
set style line 3 lt 12 lw 3
set xrange [0:25]
# set yrange [0:25]
f(x)=20*(5+3*x)
g(x)=1+0.04*x
h(x)=f(x)/g(x)
plot h(x) ls 1