12. Estimate an appropriate value for the marginal rate of substitution (MRS) at Point S if the price of strawberries is $1.50/flat (Ps = $1.50) and the price of kiwis is $21/flat (PK = $21). All you have to do is give the value - this is not an explain question. Note: There are no values given on the axes below, so don't attempt to estimate any coordinates. Also, a budget line based on the prices passes through Point S. W Strawberries (flat) S Z Curve B 1 - T X Y Curve A U Curve C Kiwi fruit (flat) slope- 21/1.5:-14 of budget line