8

The output current required from the 3.3V
regulator is
1uA * 0.999 + 50mA * 0.001 + 25uA = 75.999uA
The output power is
3.3V * 75.999uA = 250.8uW
The input power to the regulator is
250.8uW / 0.8 = 313.5uW
When the batteries are fully charged
the input current to the regulator is
313.5...