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1pen + 2 correction = $9.10
All time x2
2pens + 4 correction = $18.20
2pens +1 correction = $8.00
Compare the different
3 correction = $10.20
1 correction = $10.20 / 3 = $3.40
From 1 pen + 2 correction = $9.10
1 pen + (2 x $3.40) = $9.10
1pen = $9.10-$6.80
= $2.30
Hope this helps
All time x2
2pens + 4 correction = $18.20
2pens +1 correction = $8.00
Compare the different
3 correction = $10.20
1 correction = $10.20 / 3 = $3.40
From 1 pen + 2 correction = $9.10
1 pen + (2 x $3.40) = $9.10
1pen = $9.10-$6.80
= $2.30
Hope this helps