Simple calculation 2: chemicals

Phr = batch size chemical ÷ batch size raw latex × %chemical × standard raw latex

Cth:
Batch size chemical = 50.5 kg
Batch size raw latex = 1800 kg
%chemical = 70%
Std raw ltx = 176 kg

Phr = 50.5 ÷ 1800 × 0.7 × 176
       = 3.456