The information below pertains to Dove $($Pty$)$ Ltd$.$

OBSERVATION VOLUME $($x$)$ TOTAL OVERHEAD

COSTS $($ y $)$

$1500028000$

$2400023000$

$3340021000$

$4540029000$

$5300016000$

$6460028000$

$7320020000$

The total$/$value of x to substitute in the normal equation xy $=$ ax $+$ bx is equal to

a$.$

$3200$

b$.$

$5400$

c$.$

$28600$

d$.$

$165000$