$1.$ A chartered bank offers a rate of $5\mathrm{.}50\%$ on investments of $$25,000$ to $$59,999$ and a rate of $5\mathrm{.}75\%$ on investments of $$60,000$ to $$99,999$ in $90-$ to $365-$day GICs.How much more will an investor earn from a single $$80,000,180-$day GIC than from two $$40,000,180-$day GICs