Suppose that 6-month, 12 -month, 18-month, 24 -month, and 30 -month zero rates are, respectively, $4 \%, 4.2 \%, 4.4 \%, 4.6 \%$, and $4.8 \%$ per annum, with continuous compounding. Estimate the cash price of a bond with a face value of 100 that will mature in 30 months and pay a coupon of $4 \%$ per annum semiannually.