Lab Corp. uses a standard cost system. Direct labour information for Product CER for the month of October follows:

Standard direct labour rate: $$6\mathrm{.}00$ per hour

Actual direct labour rate paid: $$6\mathrm{.}10$ per hour

Standard hours allowed for actual production: $1,800$ hours

Labour efficiency variance$-$unfavourable: $$700$

What were the actual hours worked?

a$.$

$1,947$ hours

b$.$

$2,470$ hours

c$.$

$1,917$ hours

d$.$

$1,915$ hours