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//markupvalue is a percent which gets divided by 100 (float), single precision is fine
int markupValue = 10;
Number nmarkupValue = new Float(markupValue/100f);

Double cost = NumberFormat.getCurrencyInstance().parse(p).doubleValue();
Double realPrice = (cost*nmarkupValue.doubleValue())+cost;
DecimalFormat df = new DecimalFormat("0.00");
String mstr[] = {mdl,"","",desc,df.format(cost),df.format(realPrice)};