Question

Mary works as an English tutor. On Monday, she earned $21.60. Each day, her daily earnings increase by $1.50. How much will Mary earn on Thursday of the same week?

Answer 1

Answer:

$26

Step-by-step explanation:

a=$21.60, d=$1.50

On Thursday she earned

=$21.5+3*1.50

=21.5+4.5

=$26

Answer 2

By arithmetic progression

t1=$21.60

d=$1.50

n=4

as we know, tn=a+(n-1)*d

t4=21.60+(4-1)1.5

=21.60+3*1.5

=$26.10