Juppose you have $$10,000$ in a savings account and the bank guarantees an $8\%$ interest rate this year. However, inflation this year is $5\mathrm{.}2\%.$ What is your approximate real interest rate or the year?

a$.2\mathrm{.}66\%$

b$.-4\mathrm{.}3\%$

c$.8\%$

d$.-2\mathrm{.}66$