The money he will have in this account if he keeps it for 10 years is $754.66.
We are going to calculate the future value using compound interest. The formula for calculating compound interest is: A = P (1 + r/n) ^nt where P = 600, n = 4, t = 10, r = 2.3%.
The future value of the account after 10 years will be:
A = 600 * (1 + 0.023/4)^10*4
A = 600 * 1.00575^40
A = 600 * 1.25777121027
A = 754.662726162
A = $754.66
Therefore, the money he will have in this account if he keeps it for 10 years is $754.66.