Answer:
21
Step-by-step explanation:
10% of 30 is 3 then 1/5 of 30 is 6 so 3+6=9 then 30-9=21

=

Cross multiply
12x=900 Divide both sides by 12.
x=75 hammers to begin with.
Answer: 530 cm^2
Step-by-step explanation:
A = 3.14 * r^2
A = 3.14 * 13 * 13
A = 3.14 * 169
A = 530 cm ^2
- Money earned =$300
- Money spent on supllies=$50
Profit =Money left after supplies

