0.0005 x 76 x 10 3 +? = 170% of 29.98?

0.0005 x 76 x 10³ + ? = 170% of 29.98
⇒ 0.038 x 1000 + ? = (30 x 170)/100
∴ ? = 51- 38 = 13 ≈ 12