4.25(2)=8.50 (multiply by 2 since there are 2 people getting this)
2.25(2)=4.50 (multiply by 2 since there are 2 people getting this)
8.50+4.50=13 (add them together to get the total cost w/out tax)
13.00*0.05=0.65 (this is how much tax is for Justin and Dan combined)
13+0.65=13.65 (add the tax to the price w/out tax)
Your answer is $13.65