how would you show his problem as a bar model

Question

A box of chalk and 2 staplers cost $10.3 boxes of chalk and 2 staplers cost $18.Find the total cost of 1 box of chalk

Answer 1

c + 2s = 10
3c + 2s = 18
subtract them:
2c = 8
c = 4
then
4+2s=10
s = 3

poor way to type it, at first I though the chalk and 2 staples cost $10.30

Answer 2

my real name is Lillianna
my grandma just wrote it like that