$1.50 is saved by purchasing 30 shin guards in packages with the lowest unit price.
Step-by-step explanation:
Step 1 :
To buy 30 shin guards from the package of 10 shin guards,
10[tex]\times[/tex]3 = $14.50[tex]\times[/tex]3
30 = $43.50
The cost for 30 shin guards is $43.50
Step 2 :
To buy 30 shin guards from the package of 15 shin guards,
15[tex]\times[/tex]2 = $22.50[tex]\times[/tex]2
30 = $45
The cost for 30 shin guards is $45
The money saved by purchasing the lowest price = $45 - $43.50 = $1.50