Answer:
$37.50
Explanation of answer:
You divide 30 by 100 and you will get 0.3 then you times 123.50 by 0.3 and you will get the answer
To round to the nearest tenth - look at the number to the right of the tenth value ( the hundredth) and follow the rule
<em>5 or more round up, 4 or less round down
</em>As 1 is lower than 4, we round down.
36.11 therefore rounds down to 36.1
How many friends are there

Hope you could get an idea from here.
Doubt clarification - use comment section.