Mary is a member of a retirement annuity fund. She contributes an amount of R$6000$ per annum to the fund in the current year of assessment. She will in future increase her contributions at a rate of $5\%$ per annum until she retires from the fund, which is in $17$ years time. The current value of her interest in the fund is R$390000.$ Because of the costs involved in the administration of the fund only $94\%$ of the installments that she pays are invested in the investment fund. Assume that the funds growth rate will be $8\%$ per annum. Calculate what the value of her pension interest in the fund will be when she retires in $17$ years time.