@goodness Barak got it first

100/7 =14 remainder 2
Therefore Caleb came to withdraw 2 days after Wednesday which is friday

Thursday

If Caleb deposited the money on a Wednesday so the next 7 days continually will be Wednesdays
So we'll be finding the multiples of 7.................
Till we get to 7*14=98
So the 98th day will be a Wednesday
Then the next 100 days will be a FRIDAY which is the day Caleb deposited the money.