tolong bantuan nya kak/bang

Mₒ = tb + {d₁ / (d₁ + d₂)} × c
= 70,5 + [(18 - 12)/{(18 - 12) + (18 - 14)}] × 5
= 70,5 + {6 / (6 + 4)} × 5
= 70,5 + 6/10 × 5
= 70,5 + 3/5 × 5
= 70,5 + 3
= 73,5