Resistance and Temperature(isn't this right?)

[Tekmachine]

Homework Statement

A platinum resistance thermometer has a resistance of 200 when placed in a ice 0◦C
bath and 280 when immersed in a crucible containing a melting substance. What is
the melting point of the substance? The temperature coefficient of the platinum is
0.00392(◦C)−1. Answer in units of ◦C.

Homework Equations

R = r [1 + a(T - t)]

The Attempt at a Solution

This looks like such a simple problem, just plug and chug, but I keep getting the wrong answer.

280 = 200 [1 + 0.00392(T - 0)]
1.4 = 1 + 0.00392T
0.4 = 0.00392T
T = 102.04

 

[LowlyPion]

Homework Statement

A platinum resistance thermometer has a resistance of 200 when placed in a ice 0◦C
bath and 280 when immersed in a crucible containing a melting substance. What is
the melting point of the substance? The temperature coefficient of the platinum is
0.00392(◦C)−1. Answer in units of ◦C.

Homework Equations

R = r [1 + a(T - t)]

The Attempt at a Solution

This looks like such a simple problem, just plug and chug, but I keep getting the wrong answer.

280 = 200 [1 + 0.00392(T - 0)]
1.4 = 1 + 0.00392T
0.4 = 0.00392T
T = 102.04

The online calculator would seem to agree with your answer:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html#c3

 

[Tekmachine]

The online calculator would seem to agree with your answer:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html#c3

That's the calculator I used ^ ^, hmmmm is there something I'm forgetting to take into account? Maybe some sort of trick to the problem?

 

[LowlyPion]

That's the calculator I used ^ ^, hmmmm is there something I'm forgetting to take into account? Maybe some sort of trick to the problem?

Perhaps the significant figures is in error? They would want only 102 C?