1 sample weighs 69 ounces
It is required to sent out 188 samples
The post office charges $0.36 for every 23 ounces of weight
So for 1 sample, the cost is :
[tex]69\cancel{\text{ounces}}\times\frac{\$0.36}{23\cancel{\text{ounces}}}=\$1.08[/tex]The cost is $1.08 per sample. Since the total number of samples is 188, the total cost will be :
[tex]\$1.08\times188=\$203.04[/tex]The answer is $203.04
