The answer is 84N, but what is the mass and weight calculation?

Answer:
weight= density ×volume× 9.8
mass=density×volume
Explanation:
[tex]weight = 0.12 \times 0.04 \times 0.04 \times 3.14 \times 13600 \\ \times 9.8 = 80.351 \: n \\ \\ mass = 0.12 \times 0.04 \times 0.4 \times 3.14 \times 13600 = \\ = 8.199 \: kg[/tex]