Answer: Josh tips to his server = $5.25
He tips $1.05 his server today, than he normally would tip.
Josh final bill=$42
Step-by-step explanation:
Given: Josh subtotal amount before tax = $21.00
Previous tip =20% of 21=[tex]0.2\times21=4.2[/tex]
Current tip= 25% of 21=[tex]0.25\times21=5.25[/tex]
Josh tips to his server = $5.25
Increase in tip= [tex]5.25-4.2 =\$1.05[/tex]
So, he tips $1.05 his server today, than he normally would tip.
Now, Tax amount =7.5 % of 21=[tex]0.75\times21=\$15.75[/tex]
Hence, Josh final bill= Subtotal before tax+tip+tax
[tex]\$21+\$5.25+\$15.75=\$42[/tex]