If Richard's monthly deposit fee is R69.95 per R100, then the fee as a percentage of the deposit amount is 69.95%.
To calculate the total bank charges for R4200, we need to find the product of the deposit amount and the deposit fee percentage:
Total bank charges = R4200 x 69.95%
Total bank charges = R4200 x 0.6995
Total bank charges = R2937.90
Therefore, the total bank charges for a deposit of R4200 with a deposit fee of R69.95 per R100 is R2937.90.