First, let's express both amounts of storage in scientific notation for easy addition.
The original amount of storage is:
1.28 × 10^11 bytes.
The additional storage is:
384,000,000,000 bytes, which can be expressed in scientific notation as:
3.84 × 10^11 bytes.
Now, we can add the two amounts together:
1.28 × 10^11 + 3.84 × 10^11.
To add these, we simply add the coefficients since they have the same exponent:
(1.28 + 3.84) × 10^11 = 5.12 × 10^11.
Thus, if you buy the additional bytes, your phone would have:
5.12 × 10^11 bytes of storage.