Question 352535
{{{I=Prt}}}
Let {{{t=1 }}} year.
{{{I[1]=3000(0.075)=225}}}
{{{I[2]=5000(0.0032)=160}}}
{{{I[1]+I[2]=225+160=385}}}
{{{r=I/P=385/(3000+5000)=0.048125}}}
The combined interest rate is 4.8125%.