$29-$ A spring scale hung from the ceiling stretches by $5\mathrm{.}4$ cm when a $1\mathrm{.}8$ kg mass is hung from it$.$ The

$1\mathrm{.}8$ kg mass is removed and replaced with a $2\mathrm{.}5$ kg mass. What is the stretch of the spring?

$7\mathrm{.}5$cm

b$)5\mathrm{.}4$cm

c$)2\mathrm{.}0$cm

d$)1\mathrm{.}8$cm