Composition of Portugal 50 Centavo N#776

The composition is shown as Bronze (95 % copper, 30% tin, 20% zinc).  This totals to 145%.  In general, bronze is an alloy composed of copper and tin, brass is made with copper and zinc.  What is the correct composition for these coins?

95% Cu, 3% Sn, 2% Zn.

Same as 

N#1236

N#1237

N#3282

N#775

Thank you for your quick response and the clarification.

bondlurk51