Answer:
(a) $820
(b) Option 1, $130
Step-by-step explanation: (Solve B first)
Month = M
(b) Every 2 months the amount of $ in her bank account decreases by $130.
M6 to M8 = 460 - 330 = 130
M8 to M10 = 330 - 200 = 130
M10 to M12 = 200 - 70 = 130
Every 2 months, $130 is taken
(a) Before the 6th M, there is A amount of money
A:
M0 to M2 = 1 x $130
M2 to M4 = 1 x $130
M4 to M6 = 1 x $130
So, A = (1 + 1 + 1) x $130
= 3 x $130
= $390
At the start of the year, she had B amount of money
B:
$360 + $460 = $820