As per the information given in the question, the meal cost us 45.68. We want to give 15% of the meal amount (which is 45.68) as the tip.
Now, we know that 15% of 45.68 will be:

Thus, the total amount that we will have to leave will be the sum of the cost of the meal and the tip amount, which will amount to:

Thus, the total amount we will leave is 52.53