<human>:  A math teacher had $100 to buy three different types of calculators. A basic calculator costs $8. A scientific calculator costs twice the price as the basic while a graphing calculator costs thrice the price as the scientific. How much change did she receive after buying those three different types of calculators?
<bot>: How much does a scientific calculator cost? ** A scientific calculator costs $8 x 2 = $<<8*2=16>>16.
How much does a graphing calculator cost? ** A graphing calculator costs $16 x 3 = $<<16*3=48>>48.
How much did she spend? ** So, she spent $8 + $16 + $48 = $<<8+16+48=72>>72 for the three calculators.
How much change did she receive? ** Therefore, the math teacher received $100 - $72 = $<<100-72=28>>28 change.
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