(i) At break even point Average Propensity to save (APS) will be equal to zero because when income is equal to consumption then saving is zero and also APS will be zero.
For example : :APS‌=‌

S

Y

=‌

0

200

=0
Y‌=200
C‌=200
S‌=Y−C
‌=200−200=0
(ii) In respect of saving function OA signify dissaving on the other hand in respect of consumption function OA signify "Autonomous consumption" due to when Income is zero than consumption will be 40 so saving is negative.
At last we can say that consumption function and saving function are complementary.
Y=C+S