Answer:
Impossible to know from facts given. Maybe 192 or 320
Step-by-step explanation:
The difference between the original number, 50 and the week later 120 is 70
One way to predict the following two weeks might be to look at the the difference between the first deposit and the second deposit and predict that the amount added will increase by the same amount. That difference is 20.
50 + 70 + 90 + 110 = 320.
Another way is to look at the percentage of the increase and use that rate to predict the subsequent deposits,
The increase from the first week to the second week is 70/50. That is 1.4 or an increase of 140%. If that rate continues, the amounts are different.
50 x 1.4 = 70 70 x 1.4 = 98 98 x 1.4 = 137.2 137.2 x 1.4 = 192.08
This entire problem is suspect! There is no punctuation. And who can ensure that the beach won't be disturbed by a storm that washes away the shells or beachcombers who collect them?
