When Ela was $20,$ he started to build an investment portfolio.

$-$She opened a savings account and invested $$50$ a month until he was $40$ and earned an average annual rate of $2\mathrm{.}7\%,$ compounded monthly.

$-$When Ela was $40,$ he redeemed the savings account and invested the entire amount in a $10-$year GIC that earned $4\mathrm{.}2\%,$ compounded monthly.

$-$At maturity, he reinvested the entire value of the GIC in another $10-$year GIC that earned $4\mathrm{.}3\%,$ compounded monthly.

$-$When he was $40,$ he also purchased a $10-$year $$500$ bond that earned $3\mathrm{.}9\%,$ compounded annually.

$-$He reinvested the money at the same interest rate when the bond matured.

a$)$ What is the value of Ela's portfolio when he turns $60?$

b$)$ What is Ela's rate of return?