Java (JDK 10), 163 bytes
s->new double[]{2,5.8,2.7,1.45,1.2,2.8,3.4,2.1,.7,1.85}[s.chars().map(c->c==47?124:c==103?0:c).sum()%123%42%25%20%14]*(278-s.charAt(0))/154*(s.endsWith("g")?.75:1)
Credits
- -1 byte thanks to Kevin Cruijssen.
Olivier Grégoire
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