a) daca 8,85 .........100% 100%-5%=95%
x .......................95%
x=8,4075 clasa a VII a
8,85 clasa a VII a
daca 8,4075 .............100
y................... ...........92
y=7,7348 clasa a V a
b) 100%.................8,12 100%+8%=108%
108...... ............. ...x
x=876,96 clasa a VI a