Question 1205856
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The numbers are "nice", making it easy to solve this problem informally.<br>
From 40% full to 60% full is an increase of 20%, corresponding to an increase in mass of 189.5-158.3 = 31.2g.<br>
From 60% full to 100% full is a change of 40%, which is exactly twice the change from 40% to 60%; so the change in mass will be twice the change from 40% to 60%.<br>
2*31.2g = 62.4g; the mass when the cup is 100% full will be 189.5+62.4 = 251.9g.<br>
ANSWER: 251.9g<br>