Answer:
T = 540N + 250
Step-by-step explanation:
The amount saved by Hong after N months is
A = 155N + 250
And the amount saved by his wife after N months is
B = 385N
Then, the total amount saved is the sum of these expressions, so
T = A + B
T = (155N + 250) + (385N)
Simplifying, we get
T = 155N + 250 + 385N
T = 540N + 250
Therefore, the answer is
T = 540N + 250