clg
cls
color white
rect 0,0,300,300
color black
for i= 20 to 280 step 45
line i,20, i,290
next i
for i= 20 to 280 step 45
line 20,i, 290,i
next i

line 20,290,290,290
line 290,20,290,290

font "Times New Roman",8,40

text 20,0, "0"
text 60,0, "50"
text 100,0, "100"
text 150,0, "150"
text 195,0, "200"
text 240,0, "250"
text 280,0, "300"

text 1,15, "0"
text 1,55, "50"
text 1,100, "100"
text 1,145, "150"
text 1,190, "200"
text 1,235, "250"
text 1,280, "300"