Final answer:
Richard's total cost before sales tax for his purchase of memory cards, batteries, a phone case, and a wireless headset is $73.37.
Step-by-step explanation:
To calculate the total cost of Richard's items before sales tax, we need to multiply the cost of each type of item by the quantity purchased, and then add up all the resulting amounts.
- 2 memory cards at $8.99 each: 2 × $8.99 = $17.98
- 3 pack batteries at $7.47 each: 3 × $7.47 = $22.41
- 1 case for his phone at $2.99: $2.99
- 1 wireless headset at $29.99: $29.99
Now, we add up the amounts to find the total:
$17.98 + $22.41 + $2.99 + $29.99 = $73.37
Therefore, the total cost of his items before sales tax is $73.37.